iphone動畫 - 捕通知

Question

我使用的代碼下面幾行動畫：

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

動畫結束後，我想播放聲音。 如何在動畫完成時獲得通知？

Answer 1

CATransition是CAAnimation的子類，因此它繼承（除其他之外）delegate屬性和代表方法animationDidStop:finished:。在您想要處理事件的任何類中定義該方法，並將動畫的delegate屬性設置爲該類的對象。當動畫結束時，animationDidStop:finished:消息被髮送給委託人。

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]; 
}