Question

我有一个永远的动画，但我想在某些时候停止它我尝试removeAllAnimations但它没有用。这是我的代码。

[self.backgroundImageView.layer removeAllAnimations];

-(void)animateToLeft{
    if(isInCenter){
        [UIView animateWithDuration:10.0f animations:^{
            backgroundImageView.frame = CGRectMake(kLeftX, 0, kBackgroundWidth, kBackgroundHeight);
        }completion:^(BOOL finished) {
            [self animateToRight];
        }];
         isInCenter = NO;
    }
    else{
        [UIView animateWithDuration:20.0f animations:^{
            backgroundImageView.frame = CGRectMake(kLeftX, 0, kBackgroundWidth, kBackgroundHeight);
        }completion:^(BOOL finished) {
            [self animateToRight];
        }];
    }

}

-(void)animateToRight{
    [UIView animateWithDuration:20.0f animations:^{
        backgroundImageView.frame = CGRectMake(kRightX, 0, kBackgroundWidth, kBackgroundHeight);
    }completion:^(BOOL finished) {
        [self animateToLeft];
    }];
}

Answer 1

这在您的情况下无效。

因为[self.backgroundImageView.layer removeAllAnimations];这将删除已由[self.backgroundImageView.layer addAnimation:/*CABasicAnimation should added here*/];

添加的所有图层动画

您可以通过在完成时设置布尔变量来停止此循环，然后使用布尔变量进行检查。

Answer 2

使用布尔值，如果已设置，请不要执行下一个动画 - 也取消待处理的动画..

e.g。

@interface MyClass () {
     BOOL cancelAll;
}

@implementation MyClass

-(void)cancelAnimation {
     self.imageView.layer removeAllAnimations]; //!
     cancelAll = YES;
}

-(void)animateToLeft{
        if(cancelAll)
            return;
        ...
}

-(void)animateToRight{
        if(cancelAll)
            return;
        ...
}

ios removeAllAnimations不起作用

2 个答案: