blocks|key|143042|text|有一个名为CASpringAnimation的私有类(已经存在了一段时间了)，我非常确定它的背后正在使用它(但我还没有验证它)。不幸的是，它仍然是私有的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|143043|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/nst/iOS-Runtime-Headers/blob/master/Frameworks/QuartzCore.framework/CASpringAnimation.h^0|5|H|5|H|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

There is (and have been for a while) a private class called <a href="https://github.com/nst/iOS-Runtime-Headers/blob/master/Frameworks/QuartzCore.framework/CASpringAnimation.h"><code>CASpringAnimation</code></a> that I'm pretty sure is being used behind it all (but I haven't verified it). Unfortunately, it is still private.

blocks|key|143059|text|正如大卫所说，CASpringAnimation是私有的(目前？)，但我最近在RBBAnimation项目中遇到了RBBSpringAnimation。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|143060|我绝对可以推荐这个，它很容易取代我现有的CABasicAnimation。|143061|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/robb/RBBAnimation^0|7|H|1L|I|13|C|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

As David said, <code>CASpringAnimation</code> is private (for now?), but I recently came across <code>RBBSpringAnimation</code> from the <a href="https://github.com/robb/RBBAnimation" rel="nofollow">RBBAnimation</a> project. 

I can definitely recommend this, it was very easy to drop in as a replacement for my existing CABasicAnimation.

blocks|key|4649686|text|我编写了一个类来创建CASpringAnimation实例。它以一种非常简单的方式工作：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4649687|通过从UIKit应用编程接口创建弹簧动画，它从视图的层捕获创建的CASpringAnimation实例，复制它并返回它。|4649688|但我不知道以这种方式创建CASpringAnimation是否安全。|4649689|import+UIKit

private+let+SharedCASpringAnimationFactory+=+CASpringAnimationFactory()

public+class+CASpringAnimationFactory+{
++++private+var+dummyView:+UIView

++++private+init()+{
++++++++dummyView+=+UIView(frame:+CGRect.zeroRect)
++++}

++++private+class+var+shared:+CASpringAnimationFactory+{
++++++++return+SharedCASpringAnimationFactory
++++}


+++++public+class+func+animation(#keyPath:+String,+dumping:+CGFloat,+initialSpringVelocity:+CGFloat)+->+CABasicAnimation+{
++++++++let+duration+=+CATransaction.animationDuration()

++++++++UIView.animateWithDuration(duration,+delay:+0.0,+usingSpringWithDamping:+dumping,+initialSpringVelocity:+initialSpringVelocity,+options:+nil,
++++++++++++animations:+{+()+->+Void+in
++++++++++++++++CASpringAnimationFactory.shared.dummyView.bounds+=+CGRect(origin:+CGPoint.zero,+size:+CGSize(width:+100,+height:+100))
++++++++++++},+completion:+nil)

++++++++let+dummyLayer+=+CASpringAnimationFactory.shared.dummyView.layer

++++++++let+animations+=+dummyLayer.animationKeys().map+{dummyLayer.animationForKey($0+as+String)+as+CAAnimation}

++++++++let+arrestedAnimation+=+animations.first!.copy()+as+CABasicAnimation
++++++++arrestedAnimation.keyPath+=+keyPath
++++++++arrestedAnimation.fromValue+=+nil
++++++++arrestedAnimation.toValue+=+nil

++++++++dummyLayer.removeAllAnimations()
++++++++shared.dummyView.bounds+=+CGRect.zeroRect

++++++++return+arrestedAnimation
++++}
}|code-block|syntax|javascript|4649690|entityMap^0|A|H|0|W|H|0|C|H|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|Z|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

I wrote a class to create <code>CASpringAnimation</code> instance. It works in a pretty simple way: 

By creating a spring animation from UIKit API, it arrests the created <code>CASpringAnimation</code> instance from the view's layer, copies it and returns it. 

But I don't know if it is App Store safe that to create <code>CASpringAnimation</code> in this way.

<pre><code>import UIKit

private let SharedCASpringAnimationFactory = CASpringAnimationFactory()

public class CASpringAnimationFactory {
 private var dummyView: UIView

 private init() {
 dummyView = UIView(frame: CGRect.zeroRect)
 }

 private class var shared: CASpringAnimationFactory {
 return SharedCASpringAnimationFactory
 }


 public class func animation(#keyPath: String, dumping: CGFloat, initialSpringVelocity: CGFloat) -&gt; CABasicAnimation {
 let duration = CATransaction.animationDuration()

 UIView.animateWithDuration(duration, delay: 0.0, usingSpringWithDamping: dumping, initialSpringVelocity: initialSpringVelocity, options: nil,
 animations: { () -&gt; Void in
 CASpringAnimationFactory.shared.dummyView.bounds = CGRect(origin: CGPoint.zero, size: CGSize(width: 100, height: 100))
 }, completion: nil)

 let dummyLayer = CASpringAnimationFactory.shared.dummyView.layer

 let animations = dummyLayer.animationKeys().map {dummyLayer.animationForKey($0 as String) as CAAnimation}

 let arrestedAnimation = animations.first!.copy() as CABasicAnimation
 arrestedAnimation.keyPath = keyPath
 arrestedAnimation.fromValue = nil
 arrestedAnimation.toValue = nil

 dummyLayer.removeAllAnimations()
 shared.dummyView.bounds = CGRect.zeroRect

 return arrestedAnimation
 }
}
</code></pre>

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

<pre><code>[UIView animateWithDuration: delay: usingSpringWithDamping: initialSpringVelocity: options: animations: completion:];
</code></pre>

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

Thanks

SpringWithDamping for CALayer animations?

在使用了iOS 7中引入的UIView动态动画之后，最值得注意的是：[UIView animateWithDuration: delay: usingSpringWithDamping: initialSpringVelocity: options: animations: completion:];我想知道是否有等同...

问CALayer动画的SpringWithDamping？
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