用于CALayer动画的SpringWithDamping？ [英] SpringWithDamping for CALayer animations?

问题描述

在使用iOS 7中引入的 UIView 动态动画进行了大量游戏后，最值得注意的是：

After playing around a lot with the UIView dynamic animations introduced in iOS 7, most notably:

[UIView animateWithDuration: delay: usingSpringWithDamping: initialSpringVelocity: options: animations: completion:];

我想知道是否存在可以直接访问的'SpringWithDamping / Velocity'方法创建 CALayer 动画？即要么通过 CATransaction ， CABasicAnimation ，要么......

I was wondering if there is an equivalent to 'SpringWithDamping/Velocity' method that can be accessed directly when creating a CALayer animation? I.e. either through CATransaction, CABasicAnimation or otherwise...

谢谢

推荐答案

在 iOS9 Apple终于取得了 CASpringAnimation class public。

in iOS9 Apple finally made the CASpringAnimation class public.

你可以这样使用它：

let spring = CASpringAnimation(keyPath: "position.x")
spring.damping = 5
spring.fromValue = myLayer.position.x
spring.toValue = myLayer.position.x + 100.0
spring.duration = spring.settlingDuration
myLayer.addAnimation(spring, forKey: nil)

请注意，您无法设置动画持续时间 - 您需要为 settlingDuration 询问 CASpringAnimation 类（例如多少时间将弹出系统安定下来）然后将其设置为动画的持续时间。

Notice that you cannot set the animation duration - you need to ask the CASpringAnimation class for the settlingDuration (e.g. "How much time is going to take for the spring system to settle down") and then set it as the duration of your animation.

检查 CASpringAnimation - 它暴露了一些你可以调整的弹簧系统变量 - 刚度，质量等。

Check the header files for CASpringAnimation - it exposes a number of spring system variables you can adjust - stiffness, mass, etc.

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