iphone动画 - 捕捉通知

Question

我正在使用以下代码行来制作动画：

CATransition *animation = [self getAnimation:dirString];
    [[self view] exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
    [[[self view] layer] addAnimation:animation forKey:kAnimationKey];

动画结束后，我想播放声音。 动画完成后如何收到通知？

Answer 1

CATransition是CAAnimation的子类，因此它继承（除其他外）一个delegate属性和一个名为animationDidStop:finished:的委托方法。在您想要处理事件的任何类中定义该方法，并将动画的delegate属性设置为该类的对象。动画结束后，animationDidStop:finished:消息将发送给代理人。

例如：

AnimationDelegate.m
@implementation AnimationDelegate

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
{
     //Handle whatever needs to be done after the animation stops
}

ClassUsingAnimation.m
@implementation ClassUsingAnimation
{
    AnimationDelegate *customDelegate = [[AnimationDelegate alloc] init];
    CATransition *animation = [self getAnimation:dirString];
      animation.delegate = customDelegate;
      [[self view] exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
      [[[self view] layer] addAnimation:animation forKey:kAnimationKey];
    [customDelegate release];
}