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I referred to the DOC and it said: completion ... This block has no return value and takes a single Boolean argument that indicates whether or not the animations actually finished before the completion handler was called. ... But I find that no matter you use the bool parameter or not, the completion: block will always execute after animations: block. Just like the two simple block-based animation code snippets shown below, both of them are doing the same. [UIView animateWithDuration:0.3f delay:0.0f options:UIViewAnimationCurveEaseInOut animations:^{ [myView setAlpha:0.0f]; } completion:^(BOOL finished) { [myView removeFromSuperview]; }]; and [UIView animateWithDuration:0.3f delay:0.0f options:UIViewAnimationCurveEaseInOut animations:^{ [myView setAlpha:0.0f]; } completion:^(BOOL finished) { if (finished) [myView removeFromSuperview]; }]; And I find that most people(including me) use the first one(even the apple's official doc example). So, what's the finished parameter used for here exactly? or what's the situation will be used?

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