CATransaction completion being called immediately

ios caanimation
Javache picture Javache · Nov 14, 2013 · Viewed 18.6k times · Source

I'm trying to execute a completion-block after my CAAnimation has finished. However, it seems that animation block is called before my animation completes. The animation still happens correctly though.

[CATransaction begin];
[self.view.layer addAnimation:self.dropAndBounceAnimation forKey:@"appearance"];
[CATransaction setCompletionBlock:completionBlock];
[CATransaction commit];

The dropAndBounceAnimation is a CAKeyFrameAnimation on position.y, with a fixed duration.

Answer

Javache picture Javache · Nov 14, 2013

I'm not sure if this really is the correct fix, but by setting the completion-block before adding the animation for the layer, the completion-block is consistently called at the correct time.

[CATransaction begin];
[CATransaction setCompletionBlock:completionBlock];
[self.view.layer addAnimation:self.dropAndBounceAnimation forKey:@"appearance"];
[CATransaction commit];

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