CABasicAnimation 动画但视图框架不是持久的

Question

我今天一直在玩 CABasicAnimation 和 CAAnimationGroup，我已经爱上了它。我有几个基本动画正在发生，其中圆形缩小并缩小为圆角方形，就像 iOS 7 中的“语音备忘录”应用程序一样。

下面是它的代码。

CABasicAnimation *corner = [CABasicAnimation animationWithKeyPath:@"cornerRadius"];
corner.timingFunction = [CAMediaTimingFunction     functionWithName:kCAMediaTimingFunctionLinear];
corner.fromValue = [NSNumber numberWithFloat:recordingShape.layer.cornerRadius];
corner.toValue = [NSNumber numberWithFloat:30.0f];
corner.duration = 1.0;


//shrinking - scaling
CABasicAnimation* shrink = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
shrink.toValue = [NSNumber numberWithDouble:0.5];
shrink.duration = 0.5;


// Two animations concurrently so set up CAAnimationGroup
CAAnimationGroup *group = [CAAnimationGroup animation];
[group setDuration:0.5];
[group setAnimations:[NSArray arrayWithObjects:shrink, corner, nil]];

// Animate the layer
[[recordingShape layer] addAnimation:group forKey:@"bounceAndFade"];

动画按预期很好地发生了，但是在动画之后它又回到原来的圆形状态，谁能指导我如何保持图层的框架？

谢谢。

Answer 1

我不知道你可以为 CAAnimationGroup 组设置一个委托，因此我在调用 animationDidStop 时更改了实际的cornerRadius 和变换。