I am receiving crash reports that appear to be from a UIView animation calling a delegate that has been dealloced.

    Thread 0 Crashed:
0   libobjc.A.dylib                 0x334776f6 objc_msgSend + 18
1   UIKit                           0x31c566c4 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:]
2   UIKit                           0x31c565d2 -[UIViewAnimationState animationDidStop:finished:]
3   QuartzCore                      0x30045a26 run_animation_callbacks

I am setting the current view controller as the delegate for animations using the following pattern:

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.5];
[UIView setAnimationDelegate:self];
...
[UIView commitAnimations];

My question is, how do I set that delegate reference to nil in my dealloc method? Is there some way to retain a reference to an animation? Or fetch animations in progress?