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
UKKQueue and CVS
Dear list, I have implemented an editor where I use UKKQueue to handle changes to the file by other apps. The problem is that I don't get a notification if the file is committed to a CVS repository (or an SVN repository, for that matter). Looking at the file on disk, CVS does change the file because it updates the $Id:$ tag. If I change the file on disk with, for example, vi, then I get the notification. So why not when CVS makes the change? What's more, if I save the file in the editor then the contents of the file on disk are not updated. It seems like CVS has moved my file somewhere else but the OS knows about that. For the UKKQueue experts, I initialise my path watcher like this: UKKQueue *queue = [UKKQueue sharedFileWatcher]; [queue addPathToQueue: [aDoc pathOnDisk] notifyingAbout: UKKQueueNotifyAboutWrite]; I suspect that I'm not understanding something fundamental about how the OS is handling files and/or how CVS interacts with that. Any insights gratefully received, Martin Martin Hewitson Albert-Einstein-Institut Max-Planck-Institut fuer Gravitationsphysik und Universitaet Hannover Callinstr. 38, 30167 Hannover, Germany Tel: +49-511-762-17121, Fax: +49-511-762-5861 E-Mail: martin.hewit...@aei.mpg.de WWW: http://www.aei.mpg.de/~hewitson ___ 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
Text display consistency
Hi, I have an application that needs to display text on both Mac OS X and on iOS. I'm sticking to core technologies for my drawing and drawing all my stuff into cgcontexts for maximum portability. I sometimes need the user to edit the text, so am planning to add a subview (NSTextView / UITextView) when the user needs to edit the text. What is the best way to minimize the customization for the two versions of the application, and ensure that when I put the text view over the top, that it is exactly the same size and shape (kerning/wrapping etc) when drawn in the text view and when drawn directly in the cg context? Any gotcha's I should know about? TIA Ken. ___ 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
Text rendering/editing on OSX iOS
Hi, I have an application which I plan to roll out on both iOS and MacOS X, and it needs to display text in various places on a series of views. I am doing all the drawing using the Core technologies (CGContext drawing) to make the maximum reuse of code. I've done most of the graphical stuff and am just moving on to the text. Sometimes the user needs to edit the text, so I am planning to add a subview (NSTextView / UITextView) while they are editing, but I need to be sure that it's going to be exactly the same rendering size, position, wrapping etc. between the text views and the core drawing. Is there anything special I need to look out for to ensure that it's the same? Is this the best way for me to achieve my goal of maximum reuse and seamless switching between the drawn text and the text view for editing? TIA Ken. ___ 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: Text rendering/editing on OSX iOS
On Dec 21, 2010, at 7:04 AM, Kenneth Baxter wrote: Hi, I have an application which I plan to roll out on both iOS and MacOS X, and it needs to display text in various places on a series of views. I am doing all the drawing using the Core technologies (CGContext drawing) to make the maximum reuse of code. I've done most of the graphical stuff and am just moving on to the text. You should probably re-evaluate your approach. While it may be absolutely necessary in your case to step down to a low level, you may find it better to use higher-level platform-specific code. For my main application, the only code that is truly shared are model objects and to some extent, certain types of support controllers. All view code and the majority of controller code is completely different. And, for iOS, it's often the case where controllers and/or views are further different between iPad vs. iPhone/iPod touch. Another huge difference in my app is that the Mac OS X code leverages massive amounts of bindings. That simply doesn't exist in iOS. Thankfully, the relevant bindings code in my models (e.g. keyPathsForValuesAffectingFoo) are easily ifdef'd out when compiling on iOS. Sometimes the user needs to edit the text, so I am planning to add a subview (NSTextView / UITextView) while they are editing, but I need to be sure that it's going to be exactly the same rendering size, position, wrapping etc. between the text views and the core drawing. Is there anything special I need to look out for to ensure that it's the same? Is this the best way for me to achieve my goal of maximum reuse and seamless switching between the drawn text and the text view for editing? I'm not sure what you mean by it's the same. Do you mean pixel for pixel accuracy between Mac OS X and iOS? I don't thing that may be possible (at least at a high level) as there may be different rendering techniques. Default fonts between the systems are different and perhaps there's also subtle anti-aliasing differences, etc. Also, iPhone 4 introduced the Retina display, so output on such screens will provide much higher-quality output. Behaviors in the UI between both systems are also very different, so attempting to share code to manage behaviors will prove to be problematic. ___ 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
Improving drawing of UIView with many many Subviews
Hello all.
I have a problem, Im encoding many subviews of class CustomUIView,
each of it draws a CGImageRef, now, the encoding part its great,
fast. Also decoding,
It decodes great each sub class. but then when I add the custom view
to the parent view the nightmare starts.
this is my method that unarchive the subviews and then add each one to
the parent view:
-(void)unarchiveItemsInScene:(NSKeyedUnarchiver *)unarchiver{
NSDictionary * itemsDic = [[unarchiver
decodeObjectForKey:@BCItemsInSceneKey] retain];
[self setBc_background:[unarchiver
decodeObjectForKey:@BCSceneBackgroundKey]];
[bc_bgImageview setNeedsDisplay];
[unarchiver finishDecoding];
//Adding the elements to the scene
//Organizing the keys so the order will be constant
NSArray * keys =[self bubbleSortDictionaryByKeys:itemsDic];
for (NSString * actualKey in keys) {
BCItemView * item = [itemsDic valueForKey:actualKey];
item.bc_parentScene = self;
[bc_itemsView addSubview:item];
}
[itemsDic release];
bc_sceneHasChanges = NO;
[self setNeedsDisplay];
}
and this is the drawrect method of the BCItemView
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code.
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextTranslateCTM(context, 0, CGImageGetHeight(bc_itemImage));
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, self.bounds, bc_itemImage);
CGContextRestoreGState(context);
}
Running Time profiler, its telling me that the 100% of time its spend
on the CGContextDrawImage method.
So the symptoms are : I encode the superview's BCItemsView ( which
can be mane many or not) if they aren't many subviews the loading
process is done fast. BUT they are many, the app decodes fast, and I
see the a progress indicator showing the values as expected, but
suddenly everything seems to freeze and it takes a long time like 15
-20 seconds until the whole Parent view displays all its superviews.
is there anything I can do in order to improve the drawing
performance, or at least be able to keep progressing the indicator to
show the user that something is running? because this last thing I
tried but the progress indicator just disappears.. or doesn't' move at
all.
Thank you very much for any help.
Regards
Gustavo
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Re: Text rendering/editing on OSX iOS
Thanks Ricky, this is a very drawing-heavy application, so I think it's probably worth a little pain to get it mostly drawing cross platform, and then wrap the platform specific UI around that. I'm mostly there with that approach. Being the same refers to the size, position, rendering between core graphics and the text view on a specific operating system/device - it does not need to be pixel perfect the same between a Mac and an iPad Regards Ken PS apologies to everyone for the double posting before - Firefox 4 beta + Me.com = crash and message not showing up as sent even though it was. On 22 Dec, 2010,at 12:29 AM, Ricky Sharp rsh...@mac.com wrote: I'm not sure what you mean by it's the same. Do you mean pixel for pixel accuracy between Mac OS X and iOS? I don't thing that may be possible (at least at a high level) as there may be different rendering techniques. Default fonts between the systems are different and perhaps there's also subtle anti-aliasing differences, etc. Also, iPhone 4 introduced the Retina display, so output on such screens will provide much higher-quality output. ___ 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: No TCP connection established after ARP request
On 21 Dec 2010, at 3:53 AM, Remco Poelstra wrote: I hope this is not too much off topic, but my iPhone app tries to establish a TCP connection over Wifi. You may have better luck on the macnetworkprog list. Despite the historical name, it covers Darwin networking on all platforms. — F ___ 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: Performance: Drawing hundreds of short text strings
Hi Mike, Seconding Sherm and Joar, this will be the easiest way to get started. Down the line, if that doesn't work, have a look at Core Text. Also, I have been developing an application for drawing with text. I draw a few hundred individual letters at a time, then commit them to a graphics context so that the next time the whole view is drawn, one context is drawn rather than 1 context + n letters. T On 2010-12-21, at 12:04 AM, Sherm Pendley wrote: On Mon, Dec 20, 2010 at 11:53 PM, Joar Wingfors j...@joar.com wrote: On 20 dec 2010, at 01.22, Mark Coniglio wrote: My application needs to draw hundreds of short text strings into an NSView. After reviewing the Cocoa documentation on drawing text, I am left unsure as to how to do this with the highest level of efficiency. Don't optimize in the dark! Implement something in the most straight forward way you can imagine, and then measure the performance. If you find that it doesn't perform well enough, use your measurements to guide you to a better implementation. I don't think that we have enough information yet to provide really good suggestions. Seconded. The NSString convenience methods are the easiest, most straightforward way, so I'd try those first. If and only if they didn't perform well enough, then I'd start looking for a better-performing alternative. sherm-- -- Cocoa programming in Perl: http://camelbones.sourceforge.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/travis%40postfl.com This email sent to tra...@postfl.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
Re: Recovering from a merge conflict
On 21 Dec 2010, at 8:36 AM, Paulo Andrade wrote:
int tries = 10;
while ( tries-- ) {
// compute this batch
[moc save:error];
if (error != nil [error code] == NSManagedObjectMergeError) {
This may not be your main problem, but you should never inspect a returned
error object unless the method that returned it reports a failure:
if (! [moc save: error] [error code] == NSManagedObjectMergeError) {
...
Such methods are free to set the error object at their start, in case they
fail, but the error is correct only if the method does fail.
— F
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Re: access multiple NSTextFields as an array?
You can quickly iterate (and read) the array that way
for(NSTextField* aField in fieldsArray){
[aField doSomething];
}
So you don't need to count the items and iterate.
Regards
-- Leonardo
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Re: Performance: Drawing hundreds of short text strings
You could create an array of objects grouping the parameters of your strings
For example:
typedef struct
{
NSAttributedString*text; // it already contains color and font
NSPoint position;
} MyObj;
Or you can even create your own class MyObj
The you create the array containing a bunch of these objects MyObj
NSMutableArray *mStrings = [[NSMutableArray array] retain];
for(i = 0; i totStrings; i++){
create the object MyObj
set string, color and positions
add to the array
[mStrings addObject:anObj];
}
Then on the drawRect: method of your NSView you iterate through the array
mStrings and draw the strings with their parameters.
- (void)drawRect:(NSRect)rect
{
[super drawRect:rect];
for(anObj in mStrings ){
[anObj.text drawAtPoint:anObj.position];
}
}
Regards
-- Leonardo
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Waiting for UIWebView with Dispatch Semaphores
I’m trying to create a synchronous method on iOS (4.2.1) to create a thumbnail image for a PowerPoint file. To accomplish this, I want to load the file into a web view, then wait for it to load, then render its context into a new graphics context and save it to an image. Here’s what I have so far: http://pastie.org/1395434 I’ve tried adding the web view as a subview of the UIWindow to force it to render, but that didn’t seem to matter. The problem is line 26: waiting for the semaphore to be signaled blocks the thread, and the web view won’t load. None of the delegate methods will ever be called while I’m blocking. Is there a way to synchronously wait for the web view? All combinations of splitting things off on separate threads fall apart when I try to wait for the image to be created. Thanks in advance for any suggestions. Jeff Kelley ___ 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: Improving drawing of UIView with many many Subviews
Why not just use a UIImageView instead of implementing a custom UIView subclass
to do this? If this is all you are doing a UIImageView is very often the
superior choice.
On Dec 21, 2010, at 6:46 AM, Gustavo Adolfo Pizano wrote:
and this is the drawrect method of the BCItemView
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code.
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextTranslateCTM(context, 0, CGImageGetHeight(bc_itemImage));
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, self.bounds, bc_itemImage);
CGContextRestoreGState(context);
}
--
David Duncan
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Re: Waiting for UIWebView with Dispatch Semaphores
On Dec 21, 2010, at 8:52 AM, Jeff Kelley wrote: Is there a way to synchronously wait for the web view? All combinations of splitting things off on separate threads fall apart when I try to wait for the image to be created. Why do this synchronously at all? The web view already gives you a notification, use that to generate your thumbnail and signal the caller. Also consider that if the rendering takes a significant time, blocking the main thread *will* cause your application to be killed by the watchdog timer. Basically trying to do this synchronously is not only a waste of time, but a dead end that will fail for anything but the simplest of scenes. -- David Duncan ___ 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: Waiting for UIWebView with Dispatch Semaphores
On Tue, Dec 21, 2010 at 11:59 AM, David Duncan david.dun...@apple.com wrote: Why do this synchronously at all? The web view already gives you a notification, use that to generate your thumbnail and signal the caller. What I’m trying to do is create a thumbnail for a PowerPoint that, when clicked, opens a web view with the PowerPoint inside. I’d like it to be synchronous so that I can create thumbnails on demand if they aren’t already created. I’ll probably move forward with something that creates a full-size image asynchronously on downloading the PowerPoint, then dynamically resize that image to make my thumbnail, but this feels like something that *should* be possible. Also consider that if the rendering takes a significant time, blocking the main thread *will* cause your application to be killed by the watchdog timer. Basically trying to do this synchronously is not only a waste of time, but a dead end that will fail for anything but the simplest of scenes. The alternative, then, would be to find a way to render a PPT on a background thread, which UIWebView doesn’t seem suited for. Thanks for your comments. Jeff Kelley ___ 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: Improving drawing of UIView with many many Subviews
Aha,,, I thought using UIView instead would be better, but I guess I was
wrong..
I will then make the modifications then and see..
Thanks for the help I will keep you informed..
G.
On Dec 21, 2010, at 5:57 PM, David Duncan wrote:
Why not just use a UIImageView instead of implementing a custom UIView
subclass to do this? If this is all you are doing a UIImageView is very often
the superior choice.
On Dec 21, 2010, at 6:46 AM, Gustavo Adolfo Pizano wrote:
and this is the drawrect method of the BCItemView
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code.
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextTranslateCTM(context, 0, CGImageGetHeight(bc_itemImage));
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, self.bounds, bc_itemImage);
CGContextRestoreGState(context);
}
--
David Duncan
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Re: Recovering from a merge conflict
On Dec 21, 2010, at 3:08 PM, Fritz Anderson wrote:
On 21 Dec 2010, at 8:36 AM, Paulo Andrade wrote:
int tries = 10;
while ( tries-- ) {
// compute this batch
[moc save:error];
if (error != nil [error code] == NSManagedObjectMergeError) {
This may not be your main problem, but you should never inspect a returned
error object unless the method that returned it reports a failure:
if (! [moc save: error] [error code] == NSManagedObjectMergeError) {
...
Such methods are free to set the error object at their start, in case they
fail, but the error is correct only if the method does fail.
— F
Thanks for noticing that, actually did not know about that. Is that written
anywhere on Apple's docs?
It's not that consistent either, take executeFetchRequest:error: for example.
But yes, I understand that I should first use the method error reporting if it
exists before delving in the NSError object.
Anyway, back to the original question..
anyone?___
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App submission
Hi, Apologies if this question is inappropriate for this mailing list - if someone is able to point me in the direction of where I need to ask or has any information themselves I would be very grateful. I am trying to find out how app submission is affected over the Christmas period. I would like an app I am developing to be on the store by a certain date and so wondered when the submission deadline would be to achieve this. Also I didn't know whether it is possible to request the app be added on a specific day? Many thanks, Dan ___ 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: App submission
Shut down from Thurs the 23rd through Tues the 28th. From: Dan Hopwood d...@biasdevelopment.com Date: Tue, 21 Dec 2010 12:39:22 -0500 Subject: App submission I am trying to find out how app submission is affected over the Christmas period. ___ 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: Performance: Drawing hundreds of short text strings
Yes, we optimized NSStringDrawing API since the documentation discouraging its use was first written. In fact, for some of short simple string rendering, it's the fastest on the platform (use -drawWithRect:... variants for the maximum efficiency if possible). So, as already mentioned, use the cleanest approach and tune if necessary. Note CoreText is a core layout engine, a building block for higher-level text engines such as AppKit. It doesn't necessarily perform better than higher-level engines which are caching by utilizing contextual info available. Aki On 2010/12/21, at 7:02, tra...@postfl.com wrote: Hi Mike, Seconding Sherm and Joar, this will be the easiest way to get started. Down the line, if that doesn't work, have a look at Core Text. Also, I have been developing an application for drawing with text. I draw a few hundred individual letters at a time, then commit them to a graphics context so that the next time the whole view is drawn, one context is drawn rather than 1 context + n letters. T On 2010-12-21, at 12:04 AM, Sherm Pendley wrote: On Mon, Dec 20, 2010 at 11:53 PM, Joar Wingfors j...@joar.com wrote: On 20 dec 2010, at 01.22, Mark Coniglio wrote: My application needs to draw hundreds of short text strings into an NSView. After reviewing the Cocoa documentation on drawing text, I am left unsure as to how to do this with the highest level of efficiency. Don't optimize in the dark! Implement something in the most straight forward way you can imagine, and then measure the performance. If you find that it doesn't perform well enough, use your measurements to guide you to a better implementation. I don't think that we have enough information yet to provide really good suggestions. Seconded. The NSString convenience methods are the easiest, most straightforward way, so I'd try those first. If and only if they didn't perform well enough, then I'd start looking for a better-performing alternative. sherm-- -- Cocoa programming in Perl: http://camelbones.sourceforge.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/travis%40postfl.com This email sent to tra...@postfl.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/aki%40apple.com This email sent to a...@apple.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
Re: Improving drawing of UIView with many many Subviews
David hello.
I just wanted to update you.
So I did the modification to subclass UIImageView instead, and just added the
userInteractionsEnable to YES, modify my NSCoding protocols methods + I add a
category for th eUIImage (NSCoding) methods, and all seemd to work perfectly,
saving time its little bit slower because it encodes the image of the
UImageView, but now loading times its faster.
Thanks
Gustavo
On Dec 21, 2010, at 5:57 PM, David Duncan wrote:
Why not just use a UIImageView instead of implementing a custom UIView
subclass to do this? If this is all you are doing a UIImageView is very often
the superior choice.
On Dec 21, 2010, at 6:46 AM, Gustavo Adolfo Pizano wrote:
and this is the drawrect method of the BCItemView
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
// Drawing code.
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextTranslateCTM(context, 0, CGImageGetHeight(bc_itemImage));
CGContextScaleCTM(context, 1.0, -1.0);
CGContextDrawImage(context, self.bounds, bc_itemImage);
CGContextRestoreGState(context);
}
--
David Duncan
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Re: Performance: Drawing hundreds of short text strings
On Dec 21, 2010, at 11:04 AM, Aki Inoue a...@apple.com wrote: Note CoreText is a core layout engine, a building block for higher-level text engines such as AppKit. It doesn't necessarily perform better than higher-level engines which are caching by utilizing contextual info available. Is there a definitive guide anywhere that documents the features NSLayoutManager has that Core Text lacks? Thanks, --Kyle Sluder___ 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
Creating an NSImage of a View and its Contents
Hi all, I'm trying to capture a view and its contents as an NSImage which I can subsequently draw in the view. The idea is that I'm trying to 'freeze' the view's content (custom sliders, buttons, menus etc) and present this image in the view. I'm getting mixed results when attempting to render to a CFLayerRef e.g.: NSRect viewRect = [self bounds]; [self lockFocus]; NSBitmapImageRep* rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:viewRect]; [self unlockFocus]; NSImage* image = [[NSImage alloc] initWithSize:viewRect.size]; [image addRepresentation:rep]; [image drawAtPoint:NSZeroPoint fromRect:viewRect operation:NSCompositeSourceOver fraction:1.0]; [image release]; [rep release]; Nothing appears to be drawn in the layer. Is there a better approach that I'm missing? Thanks, Stephen ___ 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: Creating an NSImage of a View and its Contents
Hi Stephen, This was done in the AnimatedTableView demo app available on the dev site. Check it out and let me know if you need pointing to the particular part of code that does it. corbin On Dec 21, 2010, at 12:11 PM, Stephen Blinkhorn wrote: Hi all, I'm trying to capture a view and its contents as an NSImage which I can subsequently draw in the view. The idea is that I'm trying to 'freeze' the view's content (custom sliders, buttons, menus etc) and present this image in the view. I'm getting mixed results when attempting to render to a CFLayerRef e.g.: NSRect viewRect = [self bounds]; [self lockFocus]; NSBitmapImageRep* rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:viewRect]; [self unlockFocus]; NSImage* image = [[NSImage alloc] initWithSize:viewRect.size]; [image addRepresentation:rep]; [image drawAtPoint:NSZeroPoint fromRect:viewRect operation:NSCompositeSourceOver fraction:1.0]; [image release]; [rep release]; Nothing appears to be drawn in the layer. Is there a better approach that I'm missing? Thanks, Stephen ___ 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/corbind%40apple.com This email sent to corb...@apple.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
Re: Creating an NSImage of a View and its Contents
I'll just copy the code here for you: NSRect visibleRect = [_oldContentView visibleRect]; NSBitmapImageRep *imageRep = [_oldContentView bitmapImageRepForCachingDisplayInRect:visibleRect]; [_oldContentView cacheDisplayInRect:visibleRect toBitmapImageRep:imageRep]; http://developer.apple.com/library/mac/#samplecode/AnimatedTableView/Listings/ATPopupWindow_m.html corbin On Dec 21, 2010, at 1:08 PM, Corbin Dunn wrote: Hi Stephen, This was done in the AnimatedTableView demo app available on the dev site. Check it out and let me know if you need pointing to the particular part of code that does it. corbin On Dec 21, 2010, at 12:11 PM, Stephen Blinkhorn wrote: Hi all, I'm trying to capture a view and its contents as an NSImage which I can subsequently draw in the view. The idea is that I'm trying to 'freeze' the view's content (custom sliders, buttons, menus etc) and present this image in the view. I'm getting mixed results when attempting to render to a CFLayerRef e.g.: NSRect viewRect = [self bounds]; [self lockFocus]; NSBitmapImageRep* rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:viewRect]; [self unlockFocus]; NSImage* image = [[NSImage alloc] initWithSize:viewRect.size]; [image addRepresentation:rep]; [image drawAtPoint:NSZeroPoint fromRect:viewRect operation:NSCompositeSourceOver fraction:1.0]; [image release]; [rep release]; Nothing appears to be drawn in the layer. Is there a better approach that I'm missing? Thanks, Stephen ___ 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/corbind%40apple.com This email sent to corb...@apple.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
Re: Creating an NSImage of a View and its Contents
On 21 Dec 2010, at 15:10, Corbin Dunn wrote: I'll just copy the code here for you: NSRect visibleRect = [_oldContentView visibleRect]; NSBitmapImageRep *imageRep = [_oldContentView bitmapImageRepForCachingDisplayInRect:visibleRect]; [_oldContentView cacheDisplayInRect:visibleRect toBitmapImageRep:imageRep]; Thanks Corbin, will try this technique out now. Stephen http://developer.apple.com/library/mac/#samplecode/AnimatedTableView/ Listings/ATPopupWindow_m.html corbin On Dec 21, 2010, at 1:08 PM, Corbin Dunn wrote: Hi Stephen, This was done in the AnimatedTableView demo app available on the dev site. Check it out and let me know if you need pointing to the particular part of code that does it. corbin On Dec 21, 2010, at 12:11 PM, Stephen Blinkhorn wrote: Hi all, I'm trying to capture a view and its contents as an NSImage which I can subsequently draw in the view. The idea is that I'm trying to 'freeze' the view's content (custom sliders, buttons, menus etc) and present this image in the view. I'm getting mixed results when attempting to render to a CFLayerRef e.g.: NSRect viewRect = [self bounds]; [self lockFocus]; NSBitmapImageRep* rep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:viewRect]; [self unlockFocus]; NSImage* image = [[NSImage alloc] initWithSize:viewRect.size]; [image addRepresentation:rep]; [image drawAtPoint:NSZeroPoint fromRect:viewRect operation:NSCompositeSourceOver fraction:1.0]; [image release]; [rep release]; Nothing appears to be drawn in the layer. Is there a better approach that I'm missing? Thanks, Stephen ___ 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/corbind%40apple.com This email sent to corb...@apple.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
Vertical Asian Text in Cocoa
Hi folks, As I understood it several years ago, there was no native support in Cocoa for rendering vertical Japanese text. Note that certain punctuation and compound characters are supposed to render differently when drawing in the vertical orientation than they normally would when drawing left-to-right (which is how the font normally specifies how the character is rendered) Has anything changed on this front? Is there any support in Quartz for this? Any feedback would be greatly appreciated. Thanks, Abdul ___ 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
CALayer and pixel alignment
I am drawing some CALayers, and use code like what I have below so I can draw exactly on pixels. When I draw it in my CALayer drawing code, it's not always pixel aligned. It's certainly better than if I had done no rounding, but still it is not correct. Is there something I'm not doing right? Why I think it may be CALayer based is because when I draw a whole bunch of these squares on layers, on some layers they are all aligned, and on other layers they are not - they are all affected at the same time. I do not have any scale transforms anywhere - only translations. CGContextSaveGState(gcontext); CGRect rect = CGRectMake(55.0f, -2.5f, 5.0f, 5.0f); CGRect deviceRect = CGContextConvertRectToDeviceSpace(gcontext, rect); NSDecimalNumberHandler *handler = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain scale:0 raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:NO]; deviceRect.origin.x = [[(NSDecimalNumber *)[NSDecimalNumber numberWithFloat:deviceRect.origin.x + 0.5f] decimalNumberByRoundingAccordingToBehavior:handler] floatValue] - 0.5f; deviceRect.origin.y = [[(NSDecimalNumber *)[NSDecimalNumber numberWithFloat:deviceRect.origin.y + 0.5f] decimalNumberByRoundingAccordingToBehavior:handler] floatValue] - 0.5f; deviceRect.size.width = [[(NSDecimalNumber *)[NSDecimalNumber numberWithFloat:deviceRect.size.width] decimalNumberByRoundingAccordingToBehavior:handler] floatValue]; deviceRect.size.height = [[(NSDecimalNumber *)[NSDecimalNumber numberWithFloat:deviceRect.size.height] decimalNumberByRoundingAccordingToBehavior:handler] floatValue]; CGRect drawingRect = CGContextConvertRectToUserSpace(gcontext, deviceRect); CGContextSetRGBStrokeColor(gcontext, 0.0f, 0.0f, 0.0f, 1.0f); CGContextSetRGBFillColor(gcontext, 1.0f, 1.0f, 1.0f, 1.0f); CGContextAddRect(gcontext, drawingRect); CGContextDrawPath(gcontext, kCGPathFillStroke); CGContextRestoreGState(gcontext); Regards Gideon ___ 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
UIWebview: scrolling vs anchors - followup
On December 20 I wrote: - I have a UIWebview in my app that I want to use to load an HTML document containing anchors so that I can jump around the document by tapping on the links to the various anchors. (e.g. a link at the bottom of the page to jump to the top of the page) I have the links and anchors working fine, except that for example when I am at the bottom of the page and tap on the link to jump to the top of the page, then scroll down from the top to the bottom, then tap the link to go to the top again, nothing happens. It's as if the webview thinks it is still at the top of the page. Is there any way to get the webview to realize that the top of the page is no longer visible after scrolling? I tested this on my Mac with Safari, and scrolling does not affect the action of the link and anchor there. Thanks for any help. I have spent several hours searching with no luck. Don - I thought I should add a bit more information following some further investigation. I hope it might help someone else out in the future. My idea was to include a simple help document with my app. By using HTML I could have a table of contents at the top, and a user could select a topic by tapping on it to go to an anchor further down the page. At the end of the topic would be another link to return to the top of the page. My investigations here show that if the user scrolls to the top instead of using the link, then the original link to the topic would no longer work. It appears that once an anchor is jumped to you cannot jump to that anchor again until you jump to a different anchor. This resets something. Any href link to the anchor highlights normally, but nothing happens. No web view delegate methods are called, as they are the first time the link is clicked on. Here is my test file: !DOCTYPE html html lang=en a name=top/a a href=#bottom rel=selfGo to bottom./abr a href=#bottom rel=selfGo to bottom./abr Line 1br Line 2br ... enough lines to extend below the screen. Line 3br a name=bottom/aThis is it.br a href=#top rel=selfGo to top./a/html If I click on the first Go to bottom. link I jump to the bottom as expected. If I scroll back up to the top and click on either Go to bottom. link nothing happens. If I then scroll back to the bottom and click on Go to top I jump to the top, and either of the Go to bottom links works to get me to the bottom again. Unless anyone can tell me I have missed something, I think I will file a bug report on this. Thanks, Don -- Donald S. Hall, Ph.D. Apps More Software Design, Inc. d...@appsandmore.com http://www.appsandmore.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
Strange error solved by turning off Non-contiguous Layout
I have an NSTextView that has about 1,900 characters in it. Just regular text. If I edit the text and save my app hangs at [[self managedObjectContext] commitEditing]; I found setting nonContinuousLayout to NO in the NSTextView prevents the hang but that's not really solving the problem. Here's what's strange. If I expand the window so the all the text shows without the scroll bar it doesn't hang. If I edit the same text but scroll down the get it I get a hang. If I set nonContiguousLayout to NO it doesn't hang in either scenario. What advice can anyone give as to how I can address this problem? Thanks, Brad___ 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
Exception Location
The following exception message that is being sent by the frameworks: - [NSCFArray objectAtIndex:]: index (x) beyond bounds (y) The method 'objectAtIndex:' is called in many location within the code base but the console message gives no indication where the error occurred. The error is actually occurring on users test machine that does not have Xcode installed. Is it possible somehow to get the console message to indicated where in the code the error is occurring? --Richard Somers ___ 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
hacked email account
Hi I am writing to you because you are the most contacted addresses from this account. I have rarely used this account and just realized that someone has hacked into it multiple times and is using my name in public forums. Please contact me at maryannarog...@yahoo.com if you have any information regarding the person who you have contacted here. Thank you for your assistance Maryanna ___ 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: Strange error solved by turning off Non-contiguous Layout
On Dec 21, 2010, at 10:08 PM, Brad Stone wrote: I have an NSTextView that has about 1,900 characters in it. Just regular text. If I edit the text and save my app hangs at [[self managedObjectContext] commitEditing]; I found setting nonContinuousLayout to NO in the NSTextView prevents the hang but that's not really solving the problem. Here's what's strange. If I expand the window so the all the text shows without the scroll bar it doesn't hang. If I edit the same text but scroll down the get it I get a hang. If I set nonContiguousLayout to NO it doesn't hang in either scenario. What advice can anyone give as to how I can address this problem? One useful tool is a sample of the process to see where each of its threads is spending its time. This can help identify causes of deadlocks, which is what it seems like you have. There are several process-sampling tools in Mac OS X: the sample command, the Sample Process command in Activity Monitor, the Time Profile (All Thread States) tools of Shark or Instruments. For sharing on a mailing list, the text files produced by the sample command are probably simplest. Regards, Ken ___ 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: Exception Location
On Dec 21, 2010, at 11:25 PM, Richard Somers wrote:
The following exception message that is being sent by the frameworks:
-[NSCFArray objectAtIndex:]: index (x) beyond bounds (y)
The method 'objectAtIndex:' is called in many location within the code base
but the console message gives no indication where the error occurred.
The error is actually occurring on users test machine that does not have
Xcode installed.
Is it possible somehow to get the console message to indicated where in the
code the error is occurring?
If you can deliver the user a different build of your app, you can use
NSExceptionHandler to log more detailed information about the exception. See
that class's documentation, including the conceptual guide, for more
information.
Another approach is to use DTrace. All thrown/raised exceptions from
Objective-C go through the objc_exception_throw function. So, a DTrace
one-liner like the following would print a stack trace for them:
sudo dtrace -n 'pid$target::objc_exception_throw:entry {ustack();}' -p pid of
app process
(Note that this may trace exceptions in addition to the one you're seeing
logged, if something is using exceptions internally.)
Regards,
Ken
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Re: CALayer and pixel alignment
On Dec 21, 2010, at 4:09 PM, Gideon King wrote:
When I draw it in my CALayer drawing code, it's not always pixel aligned.
You need to make sure the layer is aligned correctly too. The anchor point by
default is {0.5, 0.5}. If you place an oddly-sized layer on X.0 coordinate,
it'll be unaligned. Same with an even sized layer on a X.5 coordinate.
--
Seth Willits
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Re: CALayer and pixel alignment
Yeah, that crossed my mind too, and I thought I had tried that, but I have just
gone back through my code and found that there was a parent layer where I
hadn't set it to an integral frame. I fixed that, and it's now working
perfectly - looks so much better! Thanks for triggering me to look again.
Regards
Gideon
On 22/12/2010, at 4:25 PM, Seth Willits wrote:
On Dec 21, 2010, at 4:09 PM, Gideon King wrote:
When I draw it in my CALayer drawing code, it's not always pixel aligned.
You need to make sure the layer is aligned correctly too. The anchor point by
default is {0.5, 0.5}. If you place an oddly-sized layer on X.0 coordinate,
it'll be unaligned. Same with an even sized layer on a X.5 coordinate.
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