立即调用CATransaction完成 [英] CATransaction completion being called immediately

问题描述

我正在尝试在CAAnimation完成后执行完成块。但是，似乎在我的动画完成之前调用了动画块。动画仍然正确发生。

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];

dropAndBounceAnimation是position.y上的CAKeyFrameAnimation，具有固定的持续时间。

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

推荐答案

我不确定这是否真的是正确的解决方法，但是通过在添加动画之前设置完成块 对于图层，在正确的时间始终调用完成块。

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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