NSAccessibilityPressAction on NSMenuItem
Hi, I'm trying to perform an NSAccessibilityPressAction on a NSMenuItem in my own app. Currently I've this: [[[NSApplication sharedApplication].menu itemAtIndex:2] accessibilityPerformAction:NSAccessibilityPressAction]; I get back an unrecognised selector sent message. When I try to traverse the accessibility objects using [[NSApplication sharedApplication] accessibilityAttributeValue:NSAccessibilityMenuBarAttribute]; I get back a plain NSMenu, to which I also can not send any accessibility messages. The inspector on the other hand seems to be able to get to an AXMenuItem and send the press action to it. How do I get that AXMenuItem? Or how can I send the press action to a menu item? Thanks in advance. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Simulating sublayers in CATiledLayer
Finally it works! I now have a CALayer backed UIView with CATiledLayer sublayers with full zooming support. I'm not entirely sure what change actually turned it into something working, but I'm happy it does work now. Thanks for all support. Remco Graham Cox schreef op 26-3-2014 1:04: Did you notice what David Duncan said?: For CATiledLayer you need to ensure the levelOfDetail and levelOfDetailBias is set correctly This is crucial to being able to zoom properly. It's also not that obvious what these mean or the proper values to use, but there was a discussion about this back in December or so if I recall correctly (search for 'Threaded drawing'), which expounded on this. I got CATiledLayer zooming to work as expected with vector content remaining sharp, but only once these properties had been understood and set. --Graham On 26 Mar 2014, at 4:55 am, Remco Poelstra re...@beryllium.net wrote: Well, the parent CATiledLayer (the UIViews's layer) uses transforms for zooming, but that isn't communicated down the sublayers. The context of the sublayers is simply scaled. All I've done is set the UIView layer class to CATiledLayer. Add the UIView to a UIScrollview. And added sub CA(Tiled)Layers to the CATiledLayer of the UIView. The transform is applied to the root layer, and not to the sublayers. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Simulating sublayers in CATiledLayer
David Duncan schreef op 24-3-2014 20:41: On Mar 22, 2014, at 2:18 AM, Remco Poelstra re...@beryllium.net mailto:re...@beryllium.net wrote: How can I make sure that some custom drawing method get's called? Call -setNeedsDisplay on the layer (layers are valid by default) Hi, I tried that, but it only draws the layer once. When I zoom in, the content becomes pixelated. I tried to subclass CATiledLayer and override -setAffineTransform to set the contentsScale of all sub layers depending on the current transform, but that gives all sorts of drawing errors. Is there a way to keep the custom drawn content sharp? Like with CAShapeLayers? Thanks in advance. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Simulating sublayers in CATiledLayer
Hi, No, it doesn't. The zooming is done by changing the transform of the tiled layer, scrolling changes the bounds of the tiled layer. Remco Sandor Szatmari schreef op 25-3-2014 12:14: Remco, I don't know if zooming the layer counts as a change in the layer's bounds, but if your not already doing so, you could try calling -setNeedsDisplayOnBoundsChange: with YES. Sandor On Mar 25, 2014, at 4:56, Remco Poelstra re...@beryllium.net wrote: David Duncan schreef op 24-3-2014 20:41: On Mar 22, 2014, at 2:18 AM, Remco Poelstra re...@beryllium.net mailto:re...@beryllium.net wrote: How can I make sure that some custom drawing method get's called? Call -setNeedsDisplay on the layer (layers are valid by default) Hi, I tried that, but it only draws the layer once. When I zoom in, the content becomes pixelated. I tried to subclass CATiledLayer and override -setAffineTransform to set the contentsScale of all sub layers depending on the current transform, but that gives all sorts of drawing errors. Is there a way to keep the custom drawn content sharp? Like with CAShapeLayers? Thanks in advance. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/admin.szatmari.net%40gmail.com This email sent to admin.szatmari@gmail.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Simulating sublayers in CATiledLayer
Op 25 mrt. 2014 om 17:25 heeft David Duncan david.dun...@apple.com het volgende geschreven: On Mar 25, 2014, at 1:56 AM, Remco Poelstra re...@beryllium.net wrote: David Duncan schreef op 24-3-2014 20:41: On Mar 22, 2014, at 2:18 AM, Remco Poelstra re...@beryllium.net wrote: How can I make sure that some custom drawing method get's called? Call -setNeedsDisplay on the layer (layers are valid by default) Hi, I tried that, but it only draws the layer once. When I zoom in, the content becomes pixelated. I tried to subclass CATiledLayer and override -setAffineTransform to set the contentsScale of all sub layers depending on the current transform, but that gives all sorts of drawing errors. Is there a way to keep the custom drawn content sharp? Like with CAShapeLayers? Is this a CATiledLayer or a CALayer? CALayers don’t redraw like this when you zoom, and while there are a few techniques for doing this yourself, you have to be fairly careful to avoid huge memory spikes. For CATiledLayer you need to ensure the levelOfDetail and levelOfDetailBias is set correctly, but that should be about it. CAShapeLayers redraw automatically because they are vector content and as such can be resized. CALayers and CATiledLayers display bitmap content – tiled layers only get shaper because they are designed to maintain multiple levels of detail. I've tried with both CALayer and CATiledLayer sublayers, but the CATiledLayer also did not redraw (at higher resolution) when its parent layer has a transform. I think because the sublayer knows nothing about the transform of the parent layer. I'm also uncertain about the best moment to call setneedsdisplay on the sublayers when zooming and panning. Remco ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Simulating sublayers in CATiledLayer
Op 25 mrt. 2014 om 17:59 heeft Kyle Sluder k...@ksluder.com het volgende geschreven: On Mar 25, 2014, at 9:50 AM, Remco Poelstra re...@beryllium.net wrote: I've tried with both CALayer and CATiledLayer sublayers, but the CATiledLayer also did not redraw (at higher resolution) when its parent layer has a transform. Sounds like your solution involves ceasing the use of transforms for zooming. Well, the parent CATiledLayer (the UIViews's layer) uses transforms for zooming, but that isn't communicated down the sublayers. The context of the sublayers is simply scaled. All I've done is set the UIView layer class to CATiledLayer. Add the UIView to a UIScrollview. And added sub CA(Tiled)Layers to the CATiledLayer of the UIView. The transform is applied to the root layer, and not to the sublayers. Remco ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Simulating sublayers in CATiledLayer
Hi, So, I've been experimenting with sublayers of CATiledLayer and this indeed does work. I've created a CALayer which contains CAShapeLayers for all the paths. It all looks great, but the performance is horrible. It seems there is no bounds checking on the CAShapeLayers, so it tries to draw them all for each tile. I've tried to draw the paths directly into the sublayers, but for some reason none of the custom drawing functions is called. Not for a CALayer subclass, nor if I set a delegate for the sublayer. I create the sublayers in the following way: - CustomLayer *subLayer=[CustomLayer new]; subLayer.bounds=bounds; //bounds is calculated somewhere above //let the anchorpoint correspond to (0,0) in our space subLayer.anchorPoint=CGPointMake(-bounds.origin.x/bounds.size.width, -bounds.origin.y/bounds.size.height); //Add a cross at (0,0), for debugging purposes CAShapeLayer *shape=[CAShapeLayer new]; CGMutablePathRef path=CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, -5, 0); CGPathAddLineToPoint(path, NULL, 5, 0); CGPathMoveToPoint(path, NULL, 0, -5); CGPathAddLineToPoint(path, NULL, 0, 5); shape.path=path; shape.fillColor=nil; shape.strokeColor=[UIColor yellowColor].CGColor; subLayer.sublayers=subLayers; //subLayers is an array of CAShapeLayers [subLayer addSublayer:shape]; return subLayer; - How can I make sure that some custom drawing method get's called? Thanks in advance. Kind regards, Remco Poelstra Op 21 mrt. 2014, om 21:22 heeft Remco Poelstra re...@beryllium.net het volgende geschreven: I'm working on an iOS app which needs to draw paths. Drawing is performed in layers, each layer having its own color. Some paths add (opaque) content, while some paths remove content (i.e. draw in a clear color). Content removal should only happen on a per layer basis. This model fits exactly with CALayer, with a CALayer for each drawing layer. The drawing layers can contain up to 3 paths. Since I want to be able to zoom in, I'm using CATiledLayer. Unfortunately CATiledLayer does not allow sub layers. Thats news. What makes you believe this? The internet did. But it is not true, is it? At least apple docs don't say it is not possible. Then I wonder will it solve the problem of trying to draw everything for each tile? Seems I've new options to try tomorrow :) ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Simulating sublayers in CATiledLayer
Hi, I'm working on an iOS app which needs to draw paths. Drawing is performed in layers, each layer having its own color. Some paths add (opaque) content, while some paths remove content (i.e. draw in a clear color). Content removal should only happen on a per layer basis. This model fits exactly with CALayer, with a CALayer for each drawing layer. The drawing layers can contain up to 3 paths. Since I want to be able to zoom in, I'm using CATiledLayer. Unfortunately CATiledLayer does not allow sub layers. Now I can create a container layer which contains all the drawing layers as sublayers and call [containerLayer renderInContext:], to render it to the CATiledLayer, but it will render the complete layer for each and every tile. So performance drops considerably. I also noticed that this route only works with CAShapeLayers for each path. A custom drawInContext: does not get invoked. If I render all paths directly to the CATiledLayer and check the bounding boxes against the clipbox I get reasonable performance, but paths drawn in clear color will remove all content below them, not only content from the same drawing layer. Is there some way to render a container layer to a CATiledLayer while keeping any knowledge about the clipping path (i.e. skipping over any paths which are outside the clip bounds)? Thanks in advance. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Simulating sublayers in CATiledLayer
Op 21 mrt. 2014 om 17:28 heeft David Duncan david.dun...@apple.com het volgende geschreven: On Mar 21, 2014, at 3:53 AM, Remco Poelstra re...@beryllium.net wrote: Hi, I'm working on an iOS app which needs to draw paths. Drawing is performed in layers, each layer having its own color. Some paths add (opaque) content, while some paths remove content (i.e. draw in a clear color). Content removal should only happen on a per layer basis. This model fits exactly with CALayer, with a CALayer for each drawing layer. The drawing layers can contain up to 3 paths. Since I want to be able to zoom in, I'm using CATiledLayer. Unfortunately CATiledLayer does not allow sub layers. Thats news. What makes you believe this? The internet did. But it is not true, is it? At least apple docs don't say it is not possible. Then I wonder will it solve the problem of trying to draw everything for each tile? Seems I've new options to try tomorrow :) Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Separators line between table view cells is inonsistent
Rick Mann schreef op 28-1-2014 0:25: I have a grouped-style table view, with a section that is populated dynamically with the results of a Bluetooth LE scan. As items appear in the middle of the list (they're sorted by name), sometimes the separating line between cells doesn't draw or draws an inconsistent length. Any idea what might be causing this? The cells are custom, but straightforward in that they're just made up of UILabel and UIActivityIndicator views, using autolayout in a storyboard. It seems this is a bug in iOS7. I've the same problems. Even Mail doesn't draw the separators correctly at all times. I hope they will fix it in 7.1. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: File association using file magic
Op 22 jan. 2014, om 15:33 heeft Remco Poelstra re...@beryllium.net het volgende geschreven: I'm writing an app which has to import files without a fixed file extension. There are about 10 different commonly used file extensions around. Is it possible to associate a file to my app based on the file contents? Much like how file (1) determines a file's type? Or should I simply register all know file extensions? Thanks for both responses. I think I'll try to do both. Register all known file extensions, so the known ones get a nice document icon and the suggestion to open it with my app. And accept all other types, just in case someone comes up with a new extension. I think that will be the most useful to users. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
File association using file magic
Hi, I'm writing an app which has to import files without a fixed file extension. There are about 10 different commonly used file extensions around. Is it possible to associate a file to my app based on the file contents? Much like how file (1) determines a file's type? Or should I simply register all know file extensions? Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
UIView size after rotation
Hi, In my UIVIewController -(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration, I need to know the size of the view after it's rotated. Is there a way to calculate it if it can not be requested? The view's bounds are still in the old orientation, although the orientation property is already updated. Thanks in advance. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
UITabBarController calls viewDidAppear
Hi, I've a UITabBarController. with two tabs, that's loaded from the MainWindow.xib. It's UINavigationControllers are in the same NIB, which load their UITableViewControllers from external NIB's (as recommended by Apple). The tableview in the first tab loads in its tableView:didSelectRowAtIndexPath the same tableview as the second would (but with different properties). This is the same behaviour as the iPod application, where the artist tableview loads an album view, but you can also show albums from the tab bar controller (showing a different set of albums). When the second tableview is loaded from the first tableview, everything works fine. When the second tableview is loaded directly in the second tab, viewDidAppear is called long before the view is shown. The tableView therefore did not have time to fully initialize (and call numberOfRowsInSection:) and crashes on a wrong row insert command in viewDidAppear. How can I find out why the viewDidAppear is called to early? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: rewriting observed keyPath
Op 15 feb 2011, om 23:59 heeft Quincey Morris het volgende geschreven: On Feb 15, 2011, at 11:27, Kyle Sluder wrote: As long as -current and -preset0 return the same object, and that object is KVO-compliant for @parameters, then observing @current.parameters and @preset0.parameters are equivalent. Kyle beat me to the punch on this part of the answer, but there's one additional point -- the preferences controller *also* needs to be KVO compliant with current, otherwise changing current will leave observers of current.parameters out of date. The OP's originally posted attempt at an implementation of the current property wasn't KVO compliant, but the version I suggested was. Thanks for the insights. It works fine now. Leaves me wondering how that KVO registering works, how does the runtime now that it's the same path that is monitored? Especially in the situation where the full keyPath might not yet exist. You can still register for it and be notified as soon as it's created. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: rewriting observed keyPath
Op 16 feb 2011, om 11:39 heeft Quincey Morris het volgende geschreven: On Feb 16, 2011, at 00:19, Remco Poelstra wrote: Leaves me wondering how that KVO registering works, how does the runtime now that it's the same path that is monitored? Actually, there's no magic involved* -- it's kind of obvious**, in the sense that it has to work this way***, even if the process is a bit complicated. If you're interested, here are the gory details: Thanks! That enlightens! Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
rewriting observed keyPath
Hi,
I've a PresetsController which holds a dictionary containing preset settings
for my application. The presets contain trees (Mutable Dictionaries) of keys.
To save the GUI code from bothering with tracking the current preset, I want to
give my PresetController the option to replace a keyPath like
@current.parameter.subparameter.value to
@preset2.parameter.subparameter.value.
I implemented it with a valueForUndefinedKey:
- (id) valueForUndefinedKey:(NSString *)key {
if ([key isEqual:@current])
return [presets valueForKey:currentPreset]; //presets is a
NSMutableDicitonary, currentPreset a NSString
else
return [presets valueForKey:key];
}
, returning the dictionary belonging to the current preset. This works for
setting and reading using keyPaths. It does not work for observing a keyPath
like @current.parameter.subparameter.value. How should I implement that? I
tried monitoring all keyPaths in the dictionaries, and than calling [self
will/didChange] like:
- (void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary *)change context:(void *)context {
NSString *newKeyPath=[keyPath
stringByReplacingOccurrencesOfString:currentPreset withString:@current];
if ([keyPath hasPrefix:currentPreset]) {
if ([[change
valueForKey:NSKeyValueChangeNotificationIsPriorKey] boolValue])
[self willChangeValueForKey:newKeyPath];
else
[self didChangeValueForKey:newKeyPath];
}
}
but this doesn't trigger anything. If I replace newKeyPath with @current than
all observers will get a trigger, independent of any (sub)parameters.
What would be the correct way to trigger the observers?
Kind regards,
Remco Poelstra
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Re: rewriting observed keyPath
Hi,
Thanks for your reply.
The problem with this solution is that when I do a setValue:object
forKeyPath:@preset0.parameter, and @preset0 is the current preset,
than no KVO message is sent to observers observing the @current
variant of the keyPath. That would only happen, if they used the
actual @current.parameters keyPath.
Maybe KVO doesn't support this at all, I'm just hope it will :)
Regards,
Remco Poelstra
Op 15 feb 2011, om 19:51 heeft Quincey Morris het volgende geschreven:
On Feb 15, 2011, at 05:11, Remco Poelstra wrote:
I've a PresetsController which holds a dictionary containing
preset settings for my application. The presets contain trees
(Mutable Dictionaries) of keys.
To save the GUI code from bothering with tracking the current
preset, I want to give my PresetController the option to replace a
keyPath like @current.parameter.subparameter.value to
@preset2.parameter.subparameter.value.
I implemented it with a valueForUndefinedKey:
- (id) valueForUndefinedKey:(NSString *)key {
if ([key isEqual:@current])
return [presets valueForKey:currentPreset]; //presets is a
NSMutableDicitonary, currentPreset a NSString
else
return [presets valueForKey:key];
}
, returning the dictionary belonging to the current preset. This
works for setting and reading using keyPaths. It does not work for
observing a keyPath like @current.parameter.subparameter.value.
How should I implement that?
I think you're making this too hard. If you need to observe a key
path that includes the current key, then just define a [derived]
current property for the presets controller (assuming that's the
class that has the above code). The getter would look like this:
- (NSDictionary*) current {
return [presets valueForKey:currentPreset];
}
The only thing you have to do is make sure that current is KVO
compliant, which means that notifications need to be sent out
whenever the underlying value changes:
[self willChangeValueForKey: @current];
currentPreset = ...
[self didChangeValueForKey: @current];
wherever you change the current preset. There are other possible
variations, depending on what's most convenient with your class:
1. Obviously you could vary this by keeping a pointer to the current
preset dictionary in an instance variable too.
2. If currentPreset is itself a KVO compliant property, you don't
need to generate KVO notifications manually (the second code
fragment). Instead, you'd use:
+ (NSSet*) keyPathsForValuesAffectingCurrent {
return [NSSet setWithObject: @currentPreset];
}
and write:
self.currentPreset = ...
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UITextField not shrinking text
Hi, When I set an UILabel to adjustFontSizeToFitWidth=YES with a fontSize of 10, the label behaves as expected when I place long text in the label. When I do the same for an UITextField, the text shrinks a bit, but not to font size 10. Does anybody know why that is? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Link to Settings.App
Hi, How can I link to the settings app on iOS? If the user did not configure the WiFi, I want to switch the user to the Wifi settings pane. I know it's possible, since the app from the local railway corporation does the same thing (except for a different page inside the app). I just can't find any reference on how to do that. Can anybody point me in the right direction? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Mutable to-many relationship not observable
Op 15-1-2011 9:19, Ken Thomases schreef: Which will/didChange... methods do you use, when you've tested the manual notifications? Also, what does your -observeValueForKeyPath:ofObject:change:context: method look like? My suspicion is that you're using will/didChangeValueForKey: and your observe... method is expecting the value of the NSKeyValueChangeKindKey to be NSKeyValueChangeSetting. Instead, the automatic notifications from the mutating indexed accessors is more akin to what's generated by will/didChange:valuesAtIndexes:forKey:, and NSKeyValueChangeKindKey will be one of NSKeyValueChangeInsertion, NSKeyValueChangeRemoval, or NSKeyValueChangeReplacement. Your suspicion was right. I had implemented it completely the wrong way. Works perfect now. Thanks. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Mutable to-many relationship not observable
Hi,
I've a property digiDevices that's a to-many relationship. I've implemented the
value write accesors (in addition to the read ones, which behave perfect):
- (void) insertObject:(DigiDevice *)digiDevice
inDigiDevicesAtIndex:(NSUInteger)index {
[digiDevices insertObject:digiDevice atIndex:index];
}
- (void) removeObjectFromDigiDevicesAtIndex:(NSUInteger)index {
[digiDevices removeObjectAtIndex:index];
}
When I modify the relationship through mutableArrayValueForKey: the object is
correctly removed, but no notification is send to objects observing the array.
The KVC Guide states that I get automatic KVO by implementing these methods.
Is there something I did wrong?
Kind regards,
Remco Poelstra
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Re: Mutable to-many relationship not observable
Hi,
I add the observer as follows:
[[DigiDevicesManager sharedDigiDevicesManager] addObserver:self
forKeyPath:@digiDevices options:NSKeyValueObservingOptionOld context:nil];
It's superclass is NSObject and I did not disable automatic notifications.
If mutate the array (from inside the observed object) with [self
{will/did}change..] then everything works fine.
Regards,
Remco Poelstra
Op 14 jan 2011, om 12:11 heeft Mike Abdullah het volgende geschreven:
Show us your code that adds the observer. Also, what is the superclass of
this class?
On 14 Jan 2011, at 10:45, Remco Poelstra wrote:
Hi,
I've a property digiDevices that's a to-many relationship. I've implemented
the value write accesors (in addition to the read ones, which behave
perfect):
- (void) insertObject:(DigiDevice *)digiDevice
inDigiDevicesAtIndex:(NSUInteger)index {
[digiDevices insertObject:digiDevice atIndex:index];
}
- (void) removeObjectFromDigiDevicesAtIndex:(NSUInteger)index {
[digiDevices removeObjectAtIndex:index];
}
When I modify the relationship through mutableArrayValueForKey: the object
is correctly removed, but no notification is send to objects observing the
array. The KVC Guide states that I get automatic KVO by implementing these
methods.
Is there something I did wrong?
Kind regards,
Remco Poelstra
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Socket error and socket end
Hi, When a socket can't be created in the iOS simulator because of a refused connection, I get an end-of-socket event. On the real iPhone I get a general socket error event. Is there a reason for this difference? Can I make sure that I also receive the end-of-socket event on a real device? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
UITableView with only 1 row selectable
Hi, I've an UITableView with allowsSelection=NO; I was wondering whether it's possible to do allow selection of a specific row. Is there some way I can detect a touch of a row and simulate a select in software? Thanks in advance. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: UITableView with only 1 row selectable
Hi, Thanks for your e-mail. I've considered this, but I think it's ugly that the rows flash blue momentarily. Is there a way to avoid that? Regards, Remco Op 24 dec 2010, om 11:01 heeft Roland King het volgende geschreven: Why not do it the other way around. Set allowsSelection to YES and then implement the delegate method tableView:willSelectRowAtIndexPath: to return nil for any row you do NOT want selected (see the documentation). That seems to be apple's designed way to do this. On 24-Dec-2010, at 5:23 PM, Remco Poelstra wrote: Hi, I've an UITableView with allowsSelection=NO; I was wondering whether it's possible to do allow selection of a specific row. Is there some way I can detect a touch of a row and simulate a select in software? Thanks in advance. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/rols%40rols.org This email sent to r...@rols.org ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: UITableView with only 1 row selectable
Yes, stupid me. I did search the documentation for a related problem: How can I detect whether the will and didAppear methods are called moving upwards or downwards through the viewControllers array of a navigationController? I mean I want to detect whether a TableViewController is shown because it's pushed on the stack or because a higher level TableView is just popped. Do I need custom logic to track that? Regards, Remco Op 24 dec 2010, om 11:11 heeft Roland King het volgende geschreven: again read the documentation - it's all there .. quoting from it .. apple deals with that exact case This method is not called until users touch a row and then lift their finger; the row isn't selected until then, although it is highlighted on touch-down. You can use UITableViewCellSelectionStyleNone to disable the appearance of the cell highlight on touch-down. This method isn’t called when theediting property of the table is set to YES (that is, the table view is in editing mode). On 24-Dec-2010, at 6:03 PM, Remco Poelstra wrote: Hi, Thanks for your e-mail. I've considered this, but I think it's ugly that the rows flash blue momentarily. Is there a way to avoid that? Regards, Remco Op 24 dec 2010, om 11:01 heeft Roland King het volgende geschreven: Why not do it the other way around. Set allowsSelection to YES and then implement the delegate method tableView:willSelectRowAtIndexPath: to return nil for any row you do NOT want selected (see the documentation). That seems to be apple's designed way to do this. On 24-Dec-2010, at 5:23 PM, Remco Poelstra wrote: Hi, I've an UITableView with allowsSelection=NO; I was wondering whether it's possible to do allow selection of a specific row. Is there some way I can detect a touch of a row and simulate a select in software? Thanks in advance. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/rols%40rols.org This email sent to r...@rols.org ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: UITableView with only 1 row selectable
Hi, I'm unable to find that method. Is it still available? Kind regards, Remco Op 24 dec. 2010 om 14:01 heeft Ricky Sharp rsh...@mac.com het volgende geschreven: On Dec 24, 2010, at 4:01 AM, Roland King wrote: Why not do it the other way around. Set allowsSelection to YES and then implement the delegate method tableView:willSelectRowAtIndexPath: to return nil for any row you do NOT want selected (see the documentation). That seems to be apple's designed way to do this. Actually, tableView:shouldSelectRow: should be used instead. Have it return YES only for rows that are selectable. I'll also assume that the OP is presenting the non-selectable rows differently (e.g. dimming them) to ensure that users will understand what is selectable and what is not. On 24-Dec-2010, at 5:23 PM, Remco Poelstra wrote: Hi, I've an UITableView with allowsSelection=NO; I was wondering whether it's possible to do allow selection of a specific row. Is there some way I can detect a touch of a row and simulate a select in software? Thanks in advance. ___ Ricky A. Sharp mailto:rsh...@instantinteractive.com Instant Interactive(tm) http://www.instantinteractive.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
textFieldShouldEndEditing called multiple times
Hi, I've a UITableView with multiple UITextFields. I implemented textFieldShouldEndEditing for the UITextFields. When I enter invalid text followed by return, my textFieldShouldEndEditing is called once and editing continues. When I select another UITextField, textFieldShouldEndEditing is called multiple times. Why is that? Thanks in advance. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
No TCP connection established after ARP request
Hi, I hope this is not too much off topic, but my iPhone app tries to establish a TCP connection over Wifi. I noticed that sometimes (about 30% of the attempts), a connection is refused. I do see an ARP request, but there is no TCP SYN packet following after the answer. Is this a bug in iOS? How can I make sure that the ARP request is not needed? Or can I automatically resend the TCP SYN packet? Thanks in advance for any ideas. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Finding references to object
Hi, Instruments tells me that I've a reference to an object, while I believe that that reference should no longer exist (and the object be deallocated). How can I now find out what objects have references to my should-be-deallocated-object? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Problem with NSInputStream
Hi all,
I've a problem with NSInputStream:
In my object I create (only once) an input and output stream like:
CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault,
(CFStringRef)IPString, 2101, readStream, writeStream);
if (readStream==NULL || writeStream==NULL ) {
return NO;
}
CFReadStreamSetProperty(readStream,
kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
CFWriteStreamSetProperty(writeStream,
kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
serialInput=(NSInputStream *)readStream;
serialOutput=(NSOutputStream *)writeStream;
[serialInput setDelegate:self];
[serialOutput setDelegate:self];
[serialInput scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[serialOutput scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[serialOutput open];
[serialInput open];
When I'm done with my object, I clean it up (in dealloc) like:
[serialInput close];
[serialInput release];
[serialOutput close];
[serialOutput release];
The problem is now that the stream event handler is still called after dealloc
has finished, resulting in a crash. How can I make sure that the event handler
is not called anymore? It seems the socket does not get properly closed. Maybe
a problem with slow handshaking over Wi-Fi?
Any help is appreciated.
Kind regards,
Remco Poelstra
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Re: readonly property which is a mutable array
Op 19-11-2010 3:51, Ken Thomases schreef: I of course want the items to be read only for the outside world, but the object itself should be able to modify it. Now the compiler complains about the properties not matching. How should I solve this? Make a custom getter that returns an immutable array? Make the property refer to a mutable array? Make the property an immutable array and make copies of the array while modifying it? The ivar type and the property type don't have to match. In fact, there does not need to be any ivar backing whatsoever to properties. Change your property declaration to NSArray *, and implement the getter with [[array copy] autorelease] or similar. You don't need to implement the getter. The Cocoa docs are very clear that callers must respect the declared type of properties (i.e. return type of getters). That is, if the getter is declared to return an immutable NSArray, then callers must not interrogate the returned object to determine if it's really mutable nor invoke mutation methods on it. It may be, and often is (even in framework classes), that such a method returns an object that is, in fact, an NSMutableArray. That's an irrelevant implementation detail. Thanks for the tips. Hope this will kill some warnings :) Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
readonly property which is a mutable array
Hi,
I've a object like to following:
@interface Proto {
NSMutableArray *items;
}
@property (nonatomic,readonly) NSMutableArray *items;
@end
I also have a protocol as follows:
@protocol Proto
@property (nonatomic,readonly) NSArray *items;
@end
I of course want the items to be read only for the outside world, but the
object itself should be able to modify it. Now the compiler complains about the
properties not matching. How should I solve this? Make a custom getter that
returns an immutable array? Make the property refer to a mutable array? Make
the property an immutable array and make copies of the array while modifying it?
Any insight would be appreciated.
Kind regards,
Remco Poelstra
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valueForKeyPath: not found in protocol
Hi,
I've somewhat the same problem as a recent thread, but I can't fix it with what
was suggested in that thread.
I've to following class:
#import Foundation/Foundation.h
#import AudionetCommand.h
#import AudionetQueueDelegateProtocol.h
@interface AudionetCommandQueue : NSObject {
id AudionetQueueDelegate delegate;
}
@property (nonatomic, assign) id AudionetQueueDelegate delegate;
- (void) enqueueCommand:(AudionetCommand *)command;
@end
@implementation AudionetCommandQueue
@synthesize delegate;
- (void) enqueueCommand:(AudionetCommand *)command {
//Lots of code
if ([[delegate valueForKeyPath:@audionetDevices.address] isEqual: []]) {};
}
@end
I get the warning that valueForKeyPath: is not found in the protocols. If I
change the instance variable to id AudionetQueueDelegate,NSKeyValueCoding, I
get the error that the NSKeyValueCoding protocol can not be found. If I also
#import NSKeyValueCodingProtocol.h than that header file is not found.
How can I fix this?
Kind regards,
Remco Poelstra
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Re: valueForKeyPath: not found in protocol
That works indeed. I hoped there was a more elegant solution.
Kind regards,
Remco Poelstra
Op 16 nov 2010, om 11:43 heeft Gideon King het volgende geschreven:
AFAIK, when something is referenced as a protocol like that, the *only*
methods it knows about are the ones in the protocol. If you just cast the
delegate to type id, you should be OK (I have encountered similar situations
where this solution worked)
[(id)delegate valueForKeyPath:...
HTH
Gideon
On 16/11/2010, at 8:35 PM, Remco Poelstra wrote:
Hi,
I've somewhat the same problem as a recent thread, but I can't fix it with
what was suggested in that thread.
I've to following class:
#import Foundation/Foundation.h
#import AudionetCommand.h
#import AudionetQueueDelegateProtocol.h
@interface AudionetCommandQueue : NSObject {
id AudionetQueueDelegate delegate;
}
@property (nonatomic, assign) id AudionetQueueDelegate delegate;
- (void) enqueueCommand:(AudionetCommand *)command;
@end
@implementation AudionetCommandQueue
@synthesize delegate;
- (void) enqueueCommand:(AudionetCommand *)command {
//Lots of code
if ([[delegate valueForKeyPath:@audionetDevices.address] isEqual: []]) {};
}
@end
I get the warning that valueForKeyPath: is not found in the protocols. If I
change the instance variable to id AudionetQueueDelegate,NSKeyValueCoding,
I get the error that the NSKeyValueCoding protocol can not be found. If I
also #import NSKeyValueCodingProtocol.h than that header file is not found.
How can I fix this?
Kind regards,
Remco Poelstra
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Re: valueForKeyPath: not found in protocol
More elegant indeed :). I thought delegates had to be of type id.
Kind regards,
Remco Poelstra
Op 16 nov 2010, om 11:57 heeft Roland King het volgende geschreven:
Or use
NSObject* protocol
Instead of id. Assuming that all the objects are NSObjects.
On Nov 16, 2010, at 18:43, Gideon King gid...@novamind.com wrote:
AFAIK, when something is referenced as a protocol like that, the *only*
methods it knows about are the ones in the protocol. If you just cast the
delegate to type id, you should be OK (I have encountered similar situations
where this solution worked)
[(id)delegate valueForKeyPath:...
HTH
Gideon
On 16/11/2010, at 8:35 PM, Remco Poelstra wrote:
Hi,
I've somewhat the same problem as a recent thread, but I can't fix it with
what was suggested in that thread.
I've to following class:
#import Foundation/Foundation.h
#import AudionetCommand.h
#import AudionetQueueDelegateProtocol.h
@interface AudionetCommandQueue : NSObject {
id AudionetQueueDelegate delegate;
}
@property (nonatomic, assign) id AudionetQueueDelegate delegate;
- (void) enqueueCommand:(AudionetCommand *)command;
@end
@implementation AudionetCommandQueue
@synthesize delegate;
- (void) enqueueCommand:(AudionetCommand *)command {
//Lots of code
if ([[delegate valueForKeyPath:@audionetDevices.address] isEqual: []]) {};
}
@end
I get the warning that valueForKeyPath: is not found in the protocols. If I
change the instance variable to id
AudionetQueueDelegate,NSKeyValueCoding, I get the error that the
NSKeyValueCoding protocol can not be found. If I also #import
NSKeyValueCodingProtocol.h than that header file is not found.
How can I fix this?
Kind regards,
Remco Poelstra
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Re: valueForKeyPath: not found in protocol
Op 16 nov 2010, om 12:18 heeft Mark Wright het volgende geschreven: Your AudionetQueueDelegate protocol is probably not inheriting from NSObject (the protocol) so it warns that valueForKeyPath: is not found. It'll also probably complain about methods like respondsToSelector: which is also part of the NSObject protocol. You need to write your protocol declaration in AudionetQueueDelegateProtocol.h as: @protocol AudionetQueueDelegate NSObject ... @end Then it should silence the warnings and no casting is required (which is not the correct solution in this case I believe). That does not seem to work. I now have: #import UIKit/UIKit.h @protocol AudionetQueueDelegate NSObject @end But then the warning returns. (Having set the delegate to id AudionetQueueDelegate again). Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Detecting reading a key in KVC
Op 12-11-2010 2:26, Ken Thomases schreef:
On Nov 11, 2010, at 4:57 PM, Graham Cox wrote:
On 12/11/2010, at 3:30 AM, Ken Thomases wrote:
You should not override -setValue:forKey: or -valueForKey: if you can avoid it. Instead,
implement the methods -setValue:forUndefinedKey: and -valueForUndefinedKey:. They are
precisely for implementing dynamic properties in this manner.
Understood, but the OP's problem as I understand it is that it's not that the
key is undefined, but the value associated with it is uninitialized. So rather
than return nil, or zero, he wants to trigger a remote fetch of the value. KVC
doesn't appear to provide a mechanism for that out of the box.
He was using an NSMutableDictionary for his model, instead of a custom class.
The barrier to using a custom class was that he has many properties and didn't
want to implement them all. The suggestion was to make a class which wraps a
mutable dictionary and use the KVC methods to provide access to them and also
serve as the trigger for retrieving those which are not yet cached.
All fine so far.
The suggestion, though, was to implement the wrapper by overriding -setValue:forKey: and
-valueForKey:. You shouldn't override those, but rather override
-setValue:forUndefinedKey: and -valueForUndefinedKey:. The respective implementations
would be the same -- they would pass through to the mutable dictionary and initiate
fetches for absent values. -setValue:forKey: and -valueForKey: have some special
powers that you lose if you override them.
I think I don't get it. I now have to following:
@interface PropertiesController: NSObject {
NSMutableDictionary *properties;
}
-valueForKey:
-setValue:forKey:
@end
@implementation PropertiesController
valueForKey {
id retVal=[properties valueForKey:key];
if (!retVal) {
//fetch value from network
//We do not wait for the value
}
return retVal;
}
@end
If I ommit the valueForKey method, how does the KVC logic now, that it
should check the properties variable?
Further more, NSDictionary seems to always return a value, so all keys
are defined, they just return nil sometimes. How can
valueForUndefinedKey: then ever be called?
Kind regards,
Remco Poelstra
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Re: Detecting reading a key in KVC
Op 12-11-2010 12:13, Graham Cox schreef:
nil from NSDictionary means no value associated with the key
(dictionaries cannot store 'nil' as a value) so this is your cue to
go fetch. The problem is that the object on which
-valueForUndefinedKey: is invoked is the dictionary, not your
wrapper, and since you are not subclassing the dictionary, you won't
get that message (and the default will simply throw an exception). So
instead, the override to -valueForKey: in your wrapper is acceptable,
in this case. But instead of invoking -valueForKey: on the
dictionary, use -objectForKey: directly. That way, you get nil when
there's no key instead of an exception.
Unfortunatly this does not seem to be true. I use valueForKey on the
dictionary and for non-existing keys, nil is returned. No exception is
thrown. This is not a major problem I think, as I can just test for nil
as with objectForKey.
If you have properties that can legally be nil, you'll need to treat
those differently, using some sort of marker object that means the
property really should return nil (and hence can be stored in a
dictionary). For example [NSNull null] is a valid object which means
'nil'. Basically, you can't use nil itself to mean two different
things, both uninitialized and a legal value, and since NSDictionary
reserves the use of nil to mean undefined, you have no choice but to
deal with that in some way.
Fortunatly, this is not a problem, all my properties are non-nil.
@implementation MyWrapper
- (id) valueForKey:(NSString*) key { id value = [myDictionary
objectForKey:key];
if( value ) return value;
[self beginFetchForKey:key];// assume starts a thread or
asynchronous task which calls -setValue:forKey: on completion
return nil; // OK, we have no value to return yet. }
- (void) setNilValueForKey:(NSString*) key { [myDictionary
setObject:[NSNull null] forKey:key];// substitute a valid object for
nil values }
Because this does not override -setValue:forKey: you get all the
usual goodness that gives you, such as KVO notifications. As your
thread sets the value using KVC any observers get notified of the
value having been fetched automatically (if you are using a thread
take care to set the value on the main thread so that all
notifications take place on the main thread).
But if I do not override setValue:forKey: How does the KVC logic now
that it should not try to call setValue:forKey: on my wrapper object,
but on the enclosed dictionary instead? Do I not need to override
setValue:forKey: and call [myDictionary setValue:forKey] there? just as
with valueForKey:?
The override to -valueForKey: here does lose some of the 'special
powers' that Ken alluded to, one of them being the treatment of a
leading '@' in the key. If that matters, you need to emulate what
NSDictionary's implementation does. But since you are really
replacing NSDictionary's version with your own, which has already
discarded the vast majority of NSObject's 'special powers' I can't
see you are losing much in this case. It has the advantage that
subclassing NS(Mutable)Dictionary is not required.
Just out of curiosity, what is the use of the @ operator? I can't find
anything about it in the KVC Programming Guide.
Kind regards,
Remco Poelstra
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Re: Detecting reading a key in KVC
Op 12 nov 2010, om 13:37 heeft Graham Cox het volgende geschreven: On 12/11/2010, at 11:24 PM, Remco Poelstra wrote: But if I do not override setValue:forKey: How does the KVC logic now that it should not try to call setValue:forKey: on my wrapper object, but on the enclosed dictionary instead? Do I not need to override setValue:forKey: and call [myDictionary setValue:forKey] there? just as with valueForKey:? My apologies, yes, you do need to do this. Which means you'll also need to implement manual KVO notification using -willChangeValueForKey: and -didChangeValueForKey: since your object's clients will be observing it, not the internal dictionary. Thanks. I hope overriding these methods will not destroy my performance too much. I'm not sure, but this could create a problem, in that -willChangeValueForKey: MIGHT invoke -valueForKey: in order to cache the old value that is about to be changed so it can pass it in the notification. That will trigger another fetch, because the new value has not yet been set. Result, an infinite cascade of fetches. This is easy to solve using a simple lock flag, but it may not be needed (just be aware of the possibility). Yes, that happens. Not an endless loop, but every property is indeed requested twice, once by me and once by the system. Kind regards, Remco Poelstra___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Detecting reading a key in KVC
Op 12 nov 2010, om 19:16 heeft Quincey Morris het volgende geschreven:
As as been said several times in this thread, you *shouldn't*
override 'valueForKey:', but instead override
'valueForUndefinedKey:' like this:
Is this kind of override ok?:
valueForKey: {
[properties valueForKey:key];
}
Otherwise the valueForKey is called on my wrapper, instead of the
dictionary that contains the real keys. I don't see how else the KVC
logic should find out about that instance variable.
@implementation PropertiesController
- (id) valueForUndefinedKey: (NSString*) key {
id retVal=[properties objectForKey:key]; // note: NOT 'valueForKey:'
if (!retVal) {
//fetch value from network
//We do not wait for the value
}
return retVal;
}
@end
If you want to know how control reaches this method, read the
documentation:
http://developer.apple.com/library/mac/#documentation/Cocoa/
Conceptual/KeyValueCoding/Concepts/SearchImplementation.html%23//
apple_ref/doc/uid/2955-CJBBBFFA
Unfortunatly, this does not seem to hold for a NSDictionary. It always
returns something instead of calling valueForUndefinedKey:
Regards,
Remco Poelstra
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Re: Detecting reading a key in KVC
Op 12 nov 2010, om 20:44 heeft Quincey Morris het volgende geschreven: In case 2, which seems like the superior solution, the private dictionary isn't being accessed via KVC at all, so the only KVC behavior you're concerned with is that of the wrapper. Ah, that explains. If I understand it correctly, for all properties, each and everytime, valueForUndefinedKey is called? So I do also need to override setValue:forUndefinedKey in case 2? To make sure that the properties end up in the dictionary? Basically it's the same to what I've now (based on the discussion with Graham), but adding Undefined to my method names, I do keep the performance enhancements of the original implementation? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Detecting reading a key in KVC
Op 10-11-2010 15:31, Quincey Morris schreef: On Nov 10, 2010, at 06:10, jonat...@mugginsoft.com wrote: I was just thinking that the overrides would provide a convenient point to process all requests for undefined properties. Depends on the design and requirements of the model I suppose. I don't think that's happening here -- the property isn't undefined initially, it just has an incorrect value initially. :) The point is, I think, to avoid overriding 'valueForKey:', because of the potential horrendous performance problems that could result. Thanks for all replies. I think I've a problem there. I store all my properties in a NSMutableDictionary, so implementing my own getters is not possible. I tried overriding valueForKey: by subclassing NSMutableDictionary, but soon found out that was not possible as it is a cluster. Leaves me wondering whether I should hardcode all properties (82 items) on my own object or try to make a more intelligent subclass of NSMutableDictionary. Or maybe a composite object? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Detecting reading a key in KVC
Op 11-11-2010 13:48, Graham Cox schreef: On 11/11/2010, at 11:41 PM, Remco Poelstra wrote: Leaves me wondering whether I should hardcode all properties (82 items) on my own object or try to make a more intelligent subclass of NSMutableDictionary. Or maybe a composite object? If the requirement is simply to distinguish between an uninitialised value and a real value, why not just implement your own object with a method -valueForKey: and do whatever you want in there. It could have a NSMutableDictionary as a backing store. One method (not 82) and problem solved. Sounds so simple I'm surely missing something Seems so :) I just tried that and observing the change of properties is now non-functional, as the request for observing is not forwarded to the NSDictionary behind my own object. Seems I've to override a whole lot of methods to forward them all to the backingstore. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Detecting reading a key in KVC
Op 11-11-2010 14:11, Graham Cox schreef: On 12/11/2010, at 12:01 AM, Remco Poelstra wrote: Seems so :) I just tried that and observing the change of properties is now non-functional, as the request for observing is not forwarded to the NSDictionary behind my own object. Seems I've to override a whole lot of methods to forward them all to the backingstore. You seem to be overthinking this. Just write a wrapper for -setObject:forKey: and -valueForKey: The first just calls the same method on its (mutable) dictionary, the second can first check for whether the value is actually present and if not kick off some task to fetch it, or else just get it from the dictionary and return it. You don't need to do any general purpose forwarding, unless your object has to look exactly like a dictionary externally for some reason, but even then the few methods a dictionary implements are still easy to just write wrappers for individually rather than doing a general forwarding. This is an extremely common implementation for caching and I've rarely found it more complicated than this. It might well be that I forgot to implement change notification in my wrapper for setObject:forKey: breaking KVO compliance. I'll try that out. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Detecting reading a key in KVC
Hi, I've an object which properties I access via key-value coding. These properties are sometimes uninitialized (that means, the real value needs to be read from the Wifi network). I would like to detect a read of such property and then fetch it from the network. It's not a problem that in the mean time a wrong value is returned. How can I detect a read of a property? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Joining App Developer Program
Hi, I just enrolled into the iOS program and the we are trying to contact the legal representative took two weeks. The lady on the phone said there was a large queue causing the delay. Regards, Remco Poelstra Op 3 nov 2010, om 00:00 heeft Chris Idou het volgende geschreven: Sorry if this is a little off topic, but I don't know who to ask and I can't get any sense out of Apple. I attempted to join the Mac dev program the day Steve Jobs announced it. A couple of days later I was asked to submit some company documents, which I did, and which was acknowledged. Now I've been waiting a week with no word, and I'm eager to start making any necessary changes to my app to support the app store. When I go to the site it says we are trying to contact the legal representative of your company, which kind of contradicts a separate email which says they are processing my documentation. How long should this process take? When should I get worried? Is there any way to get access to technical documentation without waiting? Is there any way to contact Apple since they don't answer emails? ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/remco%40beryllium.net This email sent to re...@beryllium.net ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
UITableViewCell is not resized in UITableView
Hi,
I've designed a UITableViewCell in Interface Builder which is 64 points
heigh.
When I load it into the UITableView, the rows are still there original
size, so all cells now have overlapping content.
Do I need to specify the new height somewhere?
I load the cell as follows (as per Apple's recommendation):
if (cell == nil) {
[[NSBundle mainBundle] loadNibNamed:@AudionetTableViewCell owner:self
options:nil];
cell=self.newCell;
self.newCell=nil;
}
Thanks in advance.
Kind regards,
Remco Poelstra
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Re: UITableViewCell is not resized in UITableView
Then we solved each others problem :) Thanks for solving mine. Groetjes, Remco Op 11 okt. 2010 om 13:07 heeft Roland King r...@rols.org het volgende geschreven: That all works fine for me. The problem *I* have it getting the UITableView to resize cells horizontally. My tableview is 200px wide, my example cell is something like 800px wide (just because that's how big the template ended up when I was drawing it) and yet once in the tableview it ends up about 380 px wide and I really haven't figured out why. I believe I have all the auto-sizing parameters set up right because it resizes in the vertical just fine. Anyway .. not your question. and typically as soon as I post I find the problem, I had the UITableView set up wider than the view containing it, that view was 200px, the UITableView was for some reason 380 .. easily fixed, now the cells do what I expect. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: init returns nil or raises exception?
Op 7-10-2010 18:12, Jean-Daniel Dupas schreef: Le 7 oct. 2010 à 18:04, Kyle Sluder a écrit : On Thu, Oct 7, 2010 at 12:47 AM, Remco Poelstrare...@beryllium.net wrote: While still in the process of cleaning up my code, I read in the documentation of NSObject that -init should return nil if it fails to initialize. But a paragraph lower it's stated that -init should always return a functional instance or raise an exception. Isn't that in conflict with the allowance of returning nil? File a documentation bug. I would imagine the paragraph about the exception is saying that an exception must be raised rather than returning a half-constructed instance of the object. I agree. The must raise an exception is a bug in the documentation IMHO. There is a lot of recent API that used the 'return nil' pattern (especially methods design to return an NSError by ref). Ah, I see. I hoped it was 'the new way to go'. I like to more than checking for nil, but I might be a bit lazy :) I'll file a bug to get the docs updated. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: init returns nil or raises exception?
Op 8 okt 2010, om 09:57 heeft Kyle Sluder het volgende geschreven:
On Fri, Oct 8, 2010 at 12:04 AM, Remco Poelstra re...@beryllium.net wrote:
Ah, I see. I hoped it was 'the new way to go'. I like to more than checking
for nil, but I might be a bit lazy :)
Checking for nil and assigning to self should be reflexes. You can
combine the two if you like. Whenever I write an -init method, I
always follow the same pattern. I don't even need to think about it:
- (id)init {
if (!(self = [super init]))
return nil;
// do other initialization
return self;
}
To my brain, it might as well be required syntax.
Yes, but in the rest of my code I've to do the check as well, so this is
actually not a good thing to do:
[someObject doSomethingWithObject:[CustomClass
customClassObjectThatMightBeNil]];
Assuming there is also a convenience class method that calls that same init as
above.
Regards,
Remco Poelstra___
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Problem using dictionary
Hi, I've the following code: NSDictionary *dict=[[NSDictionary alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@Indexes ofType:@plist]]; //This is actually a global initialized in +initialize. NSString *key=[NSString stringWithFormat:@%...@.%@,page,property]; NSLog(@%@,key); NSLog(@%@,[[dict valueForKey:key] description]); NSLog(@%@,[[[dict valueForKey:page] valueForKey:property] description]); The result from the code is: page1.fwRevCode (null) 6 The first and last are exactly what I expect. But why can't the dictionary find the value with the full key? Thanks in advance. Regards, Remco Poelstra___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Problem using dictionary
Ah, I should use valueForKeyPath:. Is there a reason valueForKey: is documented directly but valueForKeyPath: is not? Kind regards, Remco Poelstra Op 8 okt 2010, om 13:34 heeft Remco Poelstra het volgende geschreven: Hi, I've the following code: NSDictionary *dict=[[NSDictionary alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@Indexes ofType:@plist]]; //This is actually a global initialized in +initialize. NSString *key=[NSString stringWithFormat:@%...@.%@,page,property]; NSLog(@%@,key); NSLog(@%@,[[dict valueForKey:key] description]); NSLog(@%@,[[[dict valueForKey:page] valueForKey:property] description]); The result from the code is: page1.fwRevCode (null) 6 The first and last are exactly what I expect. But why can't the dictionary find the value with the full key? Thanks in advance. Regards, Remco Poelstra___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/remco%40beryllium.net This email sent to re...@beryllium.net ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Problem using dictionary
Op 8 okt 2010, om 20:34 heeft Quincey Morris het volgende geschreven: On Oct 8, 2010, at 04:47, Remco Poelstra wrote: Is there a reason valueForKey: is documented directly but valueForKeyPath: is not? They're both documented, but it requires familiarity with how to read the Cocoa documentation, which is an important point that goes beyond just this example. The methods are documented as part of the NSKeyValueCoding protocol here: http://developer.apple.com/library/mac/#documentation/Cocoa/ Reference/Foundation/Protocols/NSKeyValueCoding_Protocol/Reference/ Reference.html It's briefly mentioned, in that document and slightly more definitively in: http://developer.apple.com/library/mac/#documentation/Cocoa/ Conceptual/KeyValueCoding/Concepts/Overview.html that there's a default implementation of NSKeyValueCoding in NSObject. NSDictionary inherits this behavior from NSObject, but because the default 'valueForKeyPath:' is documented as operating in terms of 'valueForKey:', NSDictionary only needs to override the latter, and its own documentation only needs to document the override. That seems reasonable, but makes the documentation harder to read. In the old days where I used Delphi, the inherited methods were all shown as such and it gives a direct overview of what is available. Especially in this case, where the valueForKey* methods are neither mentioned in the NSObject docs, not that NSObject followsNSKeyValueCoding. Well, maybe Apple adds such functionality someday to their doc browser. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
init returns nil or raises exception?
Hi, While still in the process of cleaning up my code, I read in the documentation of NSObject that -init should return nil if it fails to initialize. But a paragraph lower it's stated that -init should always return a functional instance or raise an exception. Isn't that in conflict with the allowance of returning nil? Thanks in advance. Regards, Remco Poelstra___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Checking for nil-return
Hi, I'm cleaning up my code and I'm wondering about constructs like the next one: [NSNumber numberWithUnsignedChar:i] The documentation does not say it can return nil on failure, but does that mean it simply will never fail? What if there is no memory left? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Checking for nil-return
Op 5-10-2010 16:11, Dave DeLong schreef: Then you have much bigger problems. I already thought so :). But I noticed that [NSArray arrayWithCapacity] also never returns nil. But I can create a very large array, and I can make it bigger with addObjects:atIndexes: and that function returns void, so always succeeds. How is that possible? Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Checking for nil-return
Op 5-10-2010 16:23, Matt Gough schreef: On 5 Oct 2010, at 15:18:06, Remco Poelstra wrote: Op 5-10-2010 16:11, Dave DeLong schreef: Then you have much bigger problems. I already thought so :). But I noticed that [NSArray arrayWithCapacity] also never returns nil. But I can create a very large array, and I can make it bigger with addObjects:atIndexes: and that function returns void, so always succeeds. How is that possible? Because it throws exceptions if anything bad happens at runtime (i.e out of memory, invalid parameters etc) Google for NSException Ah, I see. I thought exceptions were meant for programming errors. This definitely helps in make sure my code behaves nice. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Property list file with NSNumber objects as keys
Hi, In the NSDictionary documentation it is stated that NSNumber objects are valid property list objects. But when I create a dictionary with NSNumbers as keys, writeToFile: fails. If I use strings, then it succeeds. Is it possible to use NSNumbers as keys and have the, read/written from/to file? Thanks in advance. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Property list file with NSNumber objects as keys
Op 4-10-2010 14:55, Roland King schreef: http://developer.apple.com/library/mac/#documentation/cocoa/Conceptual/PropertyLists/AboutPropertyLists/AboutPropertyLists.html%23//apple_ref/doc/uid/1048i-CH3-46719-CJBIGFCD No. writeToFile: writes a property list representation of the dictionary and from the above you can see that NSDictionary must have String keys to be a property list. You could turn it into NSData and write it like that perhaps. Thanks for your reply. I don't see why it have to be strings, just because it will be an XML file, but if it's not possible than that's OK for me. I just hoped that using NSNumber would make it faster (to look up), since it requires less conversions. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Changing classes
Op 30-9-2010 21:58, Quincey Morris schreef: It's not at all obvious that having your class(es) represent your hardware is the right way to approach this. What are you actually trying to achieve? If the various kinds of hardware are differentiated by their properties, then a single class encapsulating the possible properties (including a specification of which properties are actually present for each device) may be all that you need. You would only use a class hierarchy if the class has significant shared *behavior*, plus behavior that is specific to each device type. Note that I'm talking about class behavior, not device behavior. The device behavior isn't relevant to the class behavior, unless the class is a software simulation of the device. Hi, Thanks for all answers! Seems there are a lot of possibilities solving such a simple thing :) I'm representing network enabled amplifiers, some of which have multiple inputs, some not. Other have surveillance features build in, which others might not have. I'm not trying to simulate them, just representing them so I can communicate with them. I think I do not fully understand the difference you are trying to make between device and class behaviour. The amplifiers do a lot the same, but some responses might need another interpretation. In the end, all communication is over a standard protocol for all amplifiers and I want the UITableview on my iPhone to show more or less (depending on capabilities of course) the same layout. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Changing classes
Hi, I've a class that represents a general piece of hardware. Subclasses of that class represent more specific versions of that hardware. When I scan the network for hardware, I first only know some basic properties of the hardware and only after some more queries I'll know all details. I thought it would be a good thing to instantiate from the base class when I detect the hardware and then change the class to a more specific class as I find out more about the hardware. But how do I change a class? I know about the ISA pointer, but changing it doesn't allocate any additional variables. What would be a nice solution to this problem? Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Settings button in UITableView
Hi, I've a UITableView with UITableViewCell of style UITableViewStyleSubtitle. The table shows devices that the app has found on the Wifi network. When I click on a row I show a detailview of the device. This all works fine. The device has some internal configuration settings that the user needs to be able to change (like whether the device uses DHCP for its IP address). In order to let the user change these settings I've added a settings button to my UIToolbar. When the user taps the button I want to show a button for each row which allows the user to enter the configuration view. Much like the Delete button in the e-mail app. I've found out that I can change the text of the default Delete button, but how can I show that button without putting the UITableView in edit mode and requiring the user to tap the delete circle (on the left) first? Or can I add such a button on the fly to all rows? Thanks in advance. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Settings button in UITableView
Hi, Interesting point, I've been thinking about that as well. The problem is that I think it's confusing for the user. In the wifi settings pane, the user either selects the row or goes to a detail view. In my case the user goes to a tableview when he selects the row, but the disclosure button will give a (modal) detail view, so the responses are quite the same. Wouldn't that confuse them? Regards, Remco Poelstra Op 24 sep. 2010 om 17:19 heeft Conrad Shultz con...@synthetiqsolutions.com het volgende geschreven: Hi Remco, I haven't done what you're asking so I don't have the sort of ready answer others on the list probably do, but I would ask why you don't use a detail disclosure button (i.e. the right arrow inside a blue circle) in each table cell for this purpose. UITableView very much supports this motif (tap the cell contents for one set of details, tap the accessory for another) and users will be familiar with the paradigm (e.g. in WiFi settings). It also saves users a tap, and minimizes the hiding of functionality. Conrad Shultz www.synthetiqsolutions.com On Sep 24, 2010, at 1:33, Remco Poelstra re...@beryllium.net wrote: Hi, I've a UITableView with UITableViewCell of style UITableViewStyleSubtitle. The table shows devices that the app has found on the Wifi network. When I click on a row I show a detailview of the device. This all works fine. The device has some internal configuration settings that the user needs to be able to change (like whether the device uses DHCP for its IP address). In order to let the user change these settings I've added a settings button to my UIToolbar. When the user taps the button I want to show a button for each row which allows the user to enter the configuration view. Much like the Delete button in the e-mail app. I've found out that I can change the text of the default Delete button, but how can I show that button without putting the UITableView in edit mode and requiring the user to tap the delete circle (on the left) first? Or can I add such a button on the fly to all rows? ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Settings button in UITableView
Op 24 sep. 2010 om 17:15 heeft Matt Neuburg m...@tidbits.com het volgende geschreven: On Fri, 24 Sep 2010 10:33:28 +0200, Remco Poelstra re...@beryllium.net said: Hi, I've a UITableView with UITableViewCell of style UITableViewStyleSubtitle. The table shows devices that the app has found on the Wifi network. When I click on a row I show a detailview of the device. This all works fine. The device has some internal configuration settings that the user needs to be able to change (like whether the device uses DHCP for its IP address). In order to let the user change these settings I've added a settings button to my UIToolbar. When the user taps the button I want to show a button for each row which allows the user to enter the configuration view. Much like the Delete button in the e-mail app. I've found out that I can change the text of the default Delete button, but how can I show that button without putting the UITableView in edit mode and requiring the user to tap the delete circle (on the left) first? Or can I add such a button on the fly to all rows? Sure, just use a custom table view cell and you can make each cell show anything you want. What I would do is always have the button be there, and just show or hide it when I provide the cell, according to some state variable. Call reload data to ask Cocoa to ask you to provide cells again. Hi, Is there some precaution I've to take to make sure the buttons slide in nicely like they do in the mail app? I've currently no idea about coding animations and such. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Generating variable frequency tones
Op 9 sep 2010, om 21:58 heeft Remco Poelstra het volgende geschreven: I'm looking for some way to generate a tone that resembles the sound of an instrument. I need precise control of the base frequency (pitch). I'm wondering what would be the best way to generate it on an iPhone. Store a file with a know frequency and resample it to the desired frequency? Synthesize a tone by calculating a bunch of sines? Doing some FFT trick on a file? If someone can give some insight into what would best fit the H/W available it would be grateful. Hi, Thanks for all replies. Given the answers, it had less to do with Cocoa than I thought, or can be solved perfectly in a non-Cocoa specific way on the iPhone. Seems that Core Audio will be the way to go. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: First trials in Cocoa app
Op 9-9-2010 6:52, Dave Carrigan schreef: No, I missed that part about his VC being stored in the app delegate. So, yeah, if he isn't able to pass context to the C library, he can easily get to the VC in that way rather than resorting to a global. Hi, Thanks for the replies. I never expected it to be difficult, but there is so much information to process at the moment, that I'm about to miss some details here and there. Thanks for pointing them out. Regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Generating variable frequency tones
Hi, I'm looking for some way to generate a tone that resembles the sound of an instrument. I need precise control of the base frequency (pitch). I'm wondering what would be the best way to generate it on an iPhone. Store a file with a know frequency and resample it to the desired frequency? Synthesize a tone by calculating a bunch of sines? Doing some FFT trick on a file? If someone can give some insight into what would best fit the H/W available it would be grateful. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
First trials in Cocoa app
Hi all, I'm very new to Cocoa and I'm trying to build my first app after reading and doing tutorials. I've a view with a UITextView on it and a button. When I press the button I want to call a third party C library which sends out and UDP packet searching for devices on the network. The responses of the devices are reported back with a callback that I've to supply. In the callback I want to store the string information in a NSMutableString and then update the UITextView with that string. I've a few problems: How can I pass a method from an object to the C library as callback? I'm currently using the NSViewController to define the method/callback. If that's not possible, how can I define a function that can reach the objects of my application? The ViewController is stored in the ApplicationDeletegate, but I can't find any reference to that object. I've defined the NSMutableString as a global in the viewcontroller header file, is that a good idea given the MVC design pattern? Hope someone can get me started on this one. Kind regards, Remco Poelstra ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
