Hi Corbin,
>> I have a NSButton in C to remove from the array controller the A object it
>> represents. However, each time I click on that button, I first get a warning
>> telling me that I remove an observed object before releasing the observer,
>> and then the program crash,
>
> If you have a crash, it is always best to post the crash report.
Well, I wrote a workaround, so I can't give you a crash report anymore.
The crash happens in the KVO unregistering routine.
The problem is that when the represented object is removed from the array
controller, the corresponding NSView is not immediately released. Instead,
there is an implied CAAnimation (or something similar) that makes the NSView
slowly fade away. Net result is that the NSView survives some tenths of a
second after the represented object is released, and the KVO unregistering
crashes.
The (very dirty) workaround is this: instead of immediately release the
represented object, retain it, target it for delayed deletion, and then remove
it from the array; the real deletion is triggered in the dealloc routine of the
corresponding NSView (or subclass thereof) :
// Highly heterodox
- (void)dealloc {
[super dealloc];
[[[[NSApp delegate] appController] layerManager] removeTargetedCALayer];
}
I had to write it this way, instead of the more orthodox :
- (void)dealloc {
[[[[NSApp delegate] appController] layerManager] removeTargetedCALayer];
[super dealloc];
}
because the KVO removal takes place in the [super dealloc] routine…
Great WE,
Vincent_______________________________________________
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