Thanks for the nudge in the right direction James... I went back to the debugger and found an underlying problem with the two variables in the base class that were not coming through. It as a mere coincidence that it was those two in the base class, and I was not setting them correctly in the first place. Always the simple answers :)
regards, Grant On 18/01/2010, at 3:04 AM, James Bucanek wrote: > Grant Christensen <mailto:gran...@bigpond.net.au> wrote (Sunday, January 17, > 2010 6:53 AM +1000): > >> In my window I have a NSTableView that is using an array controller to get >> access to my data. The array controller is bound to an array of >> BBSMoreSpecific classes. >> >> The problem I am having is that all of my columns bound to the fields in the >> BBSMoreSpecific class show their data, but those bound to those in the base >> class do not. I am using a simple model key path of just the name of the >> ivar, so aValue and anotherValue. >> >> Can the bindings access the base class or can they only access values in the >> class the array controller is directly connected to? > > Of course you can. This is a basic principle of object oriented languages > (unless there's scoping, but Objective-C doesn't support that). You could > verify this by using a key-value path to access any of the object's NSObject > properties, like -description. > > I suspect that something else is wrong. Your simplistic example appears to be > valid, but it's obviously not the code you're using. It time to hit the > debugger.... > > Since you've declared these as formal properties, KVO should be accessing > these properties via their accessor methods. One trick is to override the > base-class getter method in your subclass like this: > > @implementation BBSMoreSpecific > ... > - (NSString*)aValue > { > NSString* value = [super aValue]; > //NSLog(@"%s returning '%@'",__func__,value); > return value; // <-- set breakpoint here > } > > Now you can set a breakpoint or log every access to that property. You > shouldn't have any problem verifying if the correct messages are being sent > (or not), by whom, and then work backwards from there. > > -- > James Bucanek > --- Grant Christensen _______________________________________________ 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
