在需要的时候如何停止的UIView动画？ [英] How to stop UIView Animation when needed?

问题描述

我有这样的code：

-(void)animationLoop{
CGPoint oldPoint = CGPointMake(myCircleUIView.frame.origin.x, myCircleUIView.frame.origin.y);
[UIView animateWithDuration:1.0
                 animations: ^{ myCircleUIView.frame = CGRectMake(myCircleUIView.frame.origin.x + [self randomFloatingGenerator], myCircleUIView.frame.origin.y + [self randomFloatingGenerator], myCircleUIView.frame.size.width, myCircleUIView.frame.size.height); }
                 completion:
 ^(BOOL finished) {
     [UIView animateWithDuration:1.0
                      animations:^{ myCircleUIView.frame = CGRectMake(oldPoint.x, oldPoint.y, myCircleUIView.frame.size.width, myCircleUIView.frame.size.height);}
                      completion:
      ^(BOOL finished) {[self animationLoop];}];
 }];
}

但我想阻止它进行交互时，但动画 [myCircleUIView.layer removeAllAnimations]; 不会做的工作，有什么建​​议

But I am trying to stop the animation when interacting with it, but [myCircleUIView.layer removeAllAnimations]; won't do the job, any suggestions?

推荐答案

当你停止动画与的CALayer的 -removeAllAnimations 完成回调调用与完成== NO 。因此，改变动画code是这样的：

When you are stopping animation with CALayer's -removeAllAnimations completion callback is called with finished == NO. So change your animation code like this:

- (void)animationLoop {
    __weak id weakSelf = self;
    CGPoint oldPoint = CGPointMake(myCircleUIView.frame.origin.x, myCircleUIView.frame.origin.y);
    [UIView animateWithDuration:1.0
                     animations:^{
                         myCircleUIView.frame = CGRectMake(myCircleUIView.frame.origin.x + [weakSelf randomFloatingGenerator], myCircleUIView.frame.origin.y + [weakSelf randomFloatingGenerator], myCircleUIView.frame.size.width, myCircleUIView.frame.size.height);
                     }
                     completion:^(BOOL finished) {
                         if (!finished) return;
                         [UIView animateWithDuration:1.0
                                          animations:^{
                                              myCircleUIView.frame = CGRectMake(oldPoint.x, oldPoint.y, myCircleUIView.frame.size.width, myCircleUIView.frame.size.height);
                                          }
                                          completion:^(BOOL finished) {
                                              if (!finished) return;
                                              [weakSelf animationLoop];
                                          }];
                     }];
}

我也劝你不要来传递强引用自来被复制到堆块，如果你真的不希望因为可能保留周期。

I also advise you not to pass strong references to self to blocks that are copied to heap if you don't really want to because of possible retain cycle.

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