CABasicAnimation为何不重复执行动画?

[weixin_37398652]

正学习CoreAnmimation,想要实现一个效果,某个图像缩小后变回原来大小,无限循环执行.代码如下:
let animation = CABasicAnimation(keyPath: "transform.scale")
animation.toValue = 0.5
animation.fromValue = 1
animation.duration = 2
animation.fillMode = "backwards"
rotationAnim.repeatCount = 3
animation.isRemovedOnCompletion = false
imageView.layer.add(animation, forKey: nil)
发现只执行一次.

[weixin_37398652]

楼上你的这样写有用吗?

[scribbler]

引用 2 楼 weixin_37398652 的回复:

楼上你的这样写有用吗?

你认为呢

[scribbler]

OC代码

    UIView * animationView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
    animationView.backgroundColor = [UIColor greenColor];
    [self.view addSubview:animationView];
    animationView.center = self.view.center;
    
    CABasicAnimation *animation = [CABasicAnimation animation];
    animation.keyPath = @"transform.scale";
    animation.duration = 1.0;
    animation.fromValue = @(1.0);
    animation.toValue = @(0.1);
    animation.autoreverses = YES;
    animation.repeatCount = HUGE_VALF;
    [animationView.layer addAnimation:animation forKey:nil];

[weixin_41694952]

你需要将 animation.fillMode = "backwards" animation.isRemovedOnCompletion = false 去掉 然后 rotationAnim.repeatCount = HUGE_VALF 另外，推荐一款动画库：https://github.com/hon-key/ThinkVerb 写动画会变得很容易