本文介绍了如何检测CATransaction触发的动画的完成情况的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个CALayer，我只是在控制器的initWithNibName中创建并添加到我的视图控制器主视图的子视图中：
然后，我执行以下动画：
I have a CALayer which I merely create and add to a subview of my view controller's main view in the controller's initWithNibName:And then, I perform the following animation:
[CATransaction begin];
[CATransaction setAnimationDuration:2];
[logoLayer setOpacity:0];
[CATransaction commit];
如何判断动画何时完成？ performSelector：延迟2秒。方法似乎并不是正确的方法。
How can I tell when this animation is done? the performSelector: delayed by 2 secs. approach doesn't seem "the right way" to go about it.
推荐答案
根据， [CATransaction setCompletionBlock：] 可以用于你想要的东西。
According to the doc, [CATransaction setCompletionBlock:] could be used for what you want.
它说
在开始动画交易之前，尝试添加类似的东西。
Try adding something like this before you begin the animation transaction.
[CATransaction setCompletionBlock:^{
// Action after the animation completion
}];
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