How to identify CAAnimation within the animationDidStop delegate?

Question

I had a problem where I had a series of overlapping CATransition / CAAnimation sequences, all of which I needed to perform custom operations when the animations stopped, but

Answer 1

The second approach will only work if you explicitly set your animation to not be removed on completion before running it:

CAAnimation *anim = ...
anim.removedOnCompletion = NO;

If you fail to do so, your animation will get removed before when it completes, and the callback will not find it in the dictionary.