animationDidStop用于组动画

Question

我有一个组动画,但我无法检测何时命中animationDidStop.我的代码示例:

[group setDelegate:self];
[view.layer addAnimation:group forKey:@"groupAnimation"];

你们中的任何人都知道我怎么知道组动画完成的时候？

Answer 1

您还需要将animationName属性设置为匹配,并确保正确定义了委托函数:

CAAnimationGroup *group = [CAAnimationGroup animation];
group.duration = 2.0f;
group.delegate = self;
[group setValue:@"groupAnimation" forKey:@"animationName"];
[group setAnimations:[NSArray arrayWithObjects:myAnimation, myOtherAnimation, nil]];
[view.layer addAnimation:group forKey:@"groupAnimation"];

...

- (void)animationDidStop:(CAAnimation *)animation finished:(BOOL)finished
{
 if (finished)
 {
  NSString *animationName = [animation valueForKey:@"animationName"];
  if ([animationName isEqualToString:@"groupAnimation"])
  {
   // your groupAnimation has ended
  }
 }
}

请注意,对于组动画,将忽略在组件动画上设置的代理.