ios - 如何判断CALayer正在做动画？

Question

场景：存在一个UILabel实例，对它做缩放，如何清除知道他正在缩放？

Answer 1

没有找到能判断是否正在执行动画的相关的API，只有下面的方法，通过判断isAnimating 来判断

// 设置初始值(最好使用全局或者属性)
    __block BOOL isAnimating =YES;
    self.transform = CGAffineTransformMakeScale(6, 6);
    [UIView animateKeyframesWithDuration:0.333 delay:0 options:0 animations:^{
        
        
        self.transform = CGAffineTransformMakeScale(1, 1);
    } completion:^(BOOL finished) {
        // 成功回调改为NO
        isAnimating = NO;
        completion();
    }];

Answer 2

-(BOOL)isAnimated
{
    BOOL animated = self.layer.animationKeys.count > 0;
    
    for (UIView *subView in self.subviews) {
        
        animated |= subView.isAnimated;
    }
    
    return animated;
    
}

Answer 3

个人感觉 用label的bool属性记录最好