ios - animationDidStop 方法的多个 CAAnimations？

Question

我知道您必须使用此方法来获取动画结束时的委托(delegate)方法:

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag {

问题是，我如何区分多个 CAAnimation，比如 2 个或更多？

我用谷歌搜索了这个，但没有发现任何有用的东西。

请与我分享您是如何做到这一点的!

谢谢!

Answer 1

您可以像这样为 CAAnimation 实例设置键/值对象:

CABasicAnimation *theAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
[theAnimation setValue:@"animation1" forKey:@"id"]; 
theAnimation.delegate = self;

CABasicAnimation *theAnimation2 = [CABasicAnimation animationWithKeyPath:@"opacity"];
[theAnimation2 setValue:@"animation2" forKey:@"id"];    
theAnimation2.delegate = self;

检查在委托(delegate)方法中调用了哪一个:

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag{
    if([[anim valueForKey:@"id"] isEqual:@"animation1"]) {
        NSLog(@"animation1");
    }
    if([[anim valueForKey:@"id"] isEqual:@"animation2"]) {
        NSLog(@"animation2");
    }
}