animationDidStop用于组animation

我有一个组animation，但我无法检测何时点击animationDidStop。 我的代码示例：

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

你们谁知道我怎么知道什么时候组animation完成？

Answer 1

您还需要将animationName属性设置为匹配，并确保您的委托函数已正确定义：

 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animation，在组件animation上设置的代表将被忽略。

Answer 2

我使用这个类别来设置完成，如下所示：

 [group setCompletionBlock:^{ }]; 

第一个CAAnimationGroup + Blocks.h：

 #import <QuartzCore/QuartzCore.h> #import <objc/runtime.h> typedef void (^TIFAnimationGroupCompletionBlock)(); @interface CAAnimationGroup (Blocks) - (void)setCompletionBlock:(TIFAnimationGroupCompletionBlock)handler; @end 

和CAAnimationGroup + Blocks.m：

 #import "CAAnimationGroup+Blocks.h" static char CAAnimationGroupBlockKey; @implementation CAAnimationGroup (Blocks) - (void)setCompletionBlock:(TIFAnimationGroupCompletionBlock)handler { objc_setAssociatedObject(self, &CAAnimationGroupBlockKey, handler, OBJC_ASSOCIATION_COPY_NONATOMIC); self.delegate = self; } - (void)animationDidStop:(CAAnimation *)animation finished:(BOOL)finished { if (finished) { TIFAnimationGroupCompletionBlock handler = (TIFAnimationGroupCompletionBlock)objc_getAssociatedObject(self, &CAAnimationGroupBlockKey); if (handler) { handler(); } } } @end 

Answer 3

我想出了一种组织好的animation完成代码的方法。 首先，我为animation完成时要运行的代码块定义了一个自定义types：

 typedef void (^animationCompletionBlock)(void); 

我定义了一个常量，用于将一个自定义的键值对添加到我的animation中：

 #define kAnimationCompletionBlock @"animationCompletionBlock" 

然后，当我创build一个animation时，如果我想在它完成时执行一个代码块，我添加一个自定义属性到我的animation，其中包含我要执行的代码块：

 animationCompletionBlock theBlock; theBlock = ^void(void) { someButton.enabled = TRUE; NSLog(@"Animation complete"); //whatever other code you want to do on completion } [myAnimation setValue: theBlock forKey: kAnimationCompletionBlock]; 

我将视图控制器设置为animation的委托：

 myAnimation.delegate = self 

最后，我编写了一个通用的animation完成方法，该方法查找附加到animation的animation完成块，如果发现它，则执行它：

 /* This method looks for a value added to the animation that just completed with the key kAnimationCompletionBlock. If it exists, it assumes it is a code block of type animationCompletionBlock, and executes the code block. This allows you to add a custom block of completion code to any animation or animation group, rather than Having a big complicated switch statement in your animationDidStop:finished: method with global animation ompletion code. (Note that the system won't call the animationDidStop:finished method for individual animations in an animation group - it will only call the completion method for the entire group. Thus, if you want to run code after part of an animation group completes, you have to set up a manual timer.) */ - (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag { animationCompletionBlock theBlock = [theAnimation valueForKey: kAnimationCompletionBlock]; if (theBlock) theBlock(); } 

除了非常干净之外，这种方法还可以让您的animation完成代码访问位于您定义块的范围内的局部variables。 这解决了将信息传递给完成方法的问题，这可能很困难。

您可以在我发布到Github的示例程序中看到这个技巧：

Github上的Core Animation演示，包括完成块代码