On 15/05/2008, at 5:21 PM, André Pang wrote:
I have a nib file containing an NSObjectController. The NSObjectController's content is set to the File's Owner proxy object, and this creates a retain cycle. (The file's owner never gets deallocated because the object controller retains it, and the object controller never gets deallocated because the file's owner retains it as an IBOutlet.)
Hmm, I just created a small test application to try to reproduce this problem and couldn't get the retain cycle to happen. It's a dead- simple document-based Cocoa application with a single NSObjectController in the nib file, with a single text field binding that was bound through the object controller to an ivar in the file's owner.
However, now the weird thing is that I call -[objectController release] in the file's owner -dealloc (which I guess should be the correct behaviour, since the object controller is declared as an IBOutlet and is a top-level nib file object), I get into an infinite "release cycle" loop. Test program here, for those willing to lend a hand:
http://algorithm.com.au/tmp/NSObjectControllerRetainCycleTest.zipAm I completely misunderstanding memory management of bindings/nib files objects?
One more note: in the application where I was having this retain cycle problem, I deleted the content outlet from the object controller in the .nib file, and instead set it programmatically via - setContent:self in the document's -awakeFromNib, balanced by a - setContent:nil in the document's -close method. That fixed it, which strongly implied that there was a retain cycle with the object controller and the file's owner object (the NSDocument subclass). I'm very puzzled.
Cheers, Andre. -- % Andre Pang : trust.in.love.to.save <http://www.algorithm.com.au/>
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