如何让处理程序重复 UIView animateWithDuration? [英] How to have a handler to repeat UIView animateWithDuration?

问题描述

我正在使用 UIView 类方法 animateWithDuration 来重复我的视图动画.我怎样才能有一个可用于稍后停止此动画的处理程序?例如，重复动画在一种方法中开始，我需要稍后从另一种方法中停止.

I'm using UIView class method animateWithDuration for repeating my view animation. How can I have a handler that could be used to stop this animation later? For example, repeated animation starts in one method and I need to stop it later from another method.

推荐答案

假设您已经创建了一个 canceled 属性，您可以执行类似的操作.如评论中所述，完成块的 startAnimation 调用需要包含在异步调用中以避免堆栈溢出.请务必将id"替换为您实际拥有的任何类类型.

You could do something like this assuming you have created a canceled property. As noted in the comments the completion block's startAnimation call needs to be wrapped in an async call to avoid a stack overflow. Be sure to replace the "id" with whatever class type you actually have.

- (void)startAnimation {
    [UIView animateWithDuration:1.0
                          delay:0.0
                        options:UIViewAnimationOptionCurveLinear | UIViewAnimationOptionAllowUserInteraction
                     animations:^(void) {
                         //animate
                     }
                     completion:^(BOOL finished) {
                         if(!self.canceled) {
                             __weak id weakSelf = self;
                             [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                                 [weakSelf startAnimation];
                             }];
                         }
                     }
     ];
}

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