如何为多个属性创建 CABasicAnimation? [英] How can I create an CABasicAnimation for multiple properties?

问题描述

我有这个代码来为 CALayer 元素设置动画.

I have this code to animate a CALayer element.

CABasicAnimation *makeBiggerAnim=[CABasicAnimation animationWithKeyPath:@"radius"];
makeBiggerAnim.duration=0.2;
makeBiggerAnim.fromValue=[NSNumber numberWithDouble:20.0];
makeBiggerAnim.toValue=[NSNumber numberWithDouble:40.0];
makeBiggerAnim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

我的问题是，现在一切正常，我想同时使用同一元素的另一个属性.我已经看到你可以制作附加动画和其他东西.

My question is, now everything works fine, I would like another attribute of the same element at the same time. I've seen you can do additive animations and stuff.

我的问题是:

• 附加属性是最好的/唯一的方法吗?(同时为同一对象的多个属性设置动画)

谢谢！

推荐答案

您可以创建一个 CAAnimationGroup 并在其上自定义持续时间和计时功能.然后创建所有 CABasicAnimations，将它们设置为值并将它们添加到动画组中.最后，将动画组添加到要设置动画的图层.

You can create an CAAnimationGroup and customize the duration and timing function on it. Then you create all your CABasicAnimations, set their to value and add them to the animation group. Finally, you add the animation group to the layer that you are animating.

这里有一个例子:

CABasicAnimation *makeBiggerAnim=[CABasicAnimation animationWithKeyPath:@"cornerRadius"];
makeBiggerAnim.fromValue=[NSNumber numberWithDouble:20.0];
makeBiggerAnim.toValue=[NSNumber numberWithDouble:40.0];

CABasicAnimation *fadeAnim=[CABasicAnimation animationWithKeyPath:@"opacity"];
fadeAnim.fromValue=[NSNumber numberWithDouble:1.0];
fadeAnim.toValue=[NSNumber numberWithDouble:0.0];

CABasicAnimation *rotateAnim=[CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];
rotateAnim.fromValue=[NSNumber numberWithDouble:0.0];
rotateAnim.toValue=[NSNumber numberWithDouble:M_PI_4];

// Customizing the group with duration etc, will apply to all the
// animations in the group
CAAnimationGroup *group = [CAAnimationGroup animation];
group.duration = 0.2;
group.repeatCount = 3;
group.autoreverses = YES;
group.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
group.animations = @[makeBiggerAnim, fadeAnim, rotateAnim];

[myLayer addAnimation:group forKey:@"allMyAnimations"];

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