Ios cabasicaniation中的键值编码混淆

我目前正在尝试创建一个自定义的UIControl，它具有基于触摸的动画。我的问题是，在调用

func setValue forKeyPath

方法时，

transform

和

opacity

关键路径没有被分开，尽管正在设置动画的层完全不同

简而言之：

当

触摸开始

和

触摸结束

时，（a）

不透明度

在名为

背景圈

的层上发生变化，并且（b）

变换

在

顶层

上应用

CATTransferM3dRotate

CALayer

有一个扩展，它（a）通过

addAnimation

添加动画，以及（b）通过

setValue

简化代码来设置关键路径的值

问题在于，不透明度不会动画恢复为零，而是逐渐增加，直到其完全不透明。但是，当我将keyPath更改为除

transform

以外的任何内容时，它会再次工作，但不会为顶层设置动画。我不确定这里到底出了什么问题，但我怀疑这与关键路径有关

以下是方法和扩展：

backgroundCircle

相关功能：

func animateCircleToTransparent(completion:()->()) {

let drawAnimation = CABasicAnimation(keyPath: "opacity")
drawAnimation.duration = 0.2
drawAnimation.repeatCount = 1
drawAnimation.fromValue = backgroundCircleOpacity
drawAnimation.toValue = 0
drawAnimation.fillMode = kCAFillModeBackwards
drawAnimation.autoreverses = false
drawAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.34, 0.01, 0.69, 1.37)
self.backgroundCircle.ocb_applyAnimation(drawAnimation)

}

func animateCircleToOpaque(completion:()->()) {

let drawAnimation = CABasicAnimation(keyPath: "opacity")
drawAnimation.duration = 0.2
drawAnimation.repeatCount = 1
drawAnimation.fromValue = 0
drawAnimation.toValue = backgroundCircleOpacity
drawAnimation.fillMode = kCAFillModeBackwards
drawAnimation.autoreverses = false
drawAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.34, 0.01, 0.69, 1.37)
self.backgroundCircle.ocb_applyAnimation(drawAnimation)
}

func animateTopLineOn() {

let topTransform = CABasicAnimation(keyPath: "transform")
topTransform.timingFunction = CAMediaTimingFunction(controlPoints: 0.5, -0.8, 0.5, 1.85)
topTransform.duration = 0.4
topTransform.fillMode = kCAFillModeBackwards

let translation = CATransform3DMakeTranslation(-4, 0, 0)
topTransform.toValue = NSValue(CATransform3D: CATransform3DRotate(translation, -0.7853975, 0, 0, 1))
topTransform.beginTime = CACurrentMediaTime() + 0.25

self.topLayer.ocb_applyAnimation(topTransform)
}


func animateTopLineOff() {


let topTransform = CABasicAnimation(keyPath: "transform")
topTransform.timingFunction = CAMediaTimingFunction(controlPoints: 0.5, -0.8, 0.5, 1.85)
topTransform.duration = 0.4
topTransform.fillMode = kCAFillModeBackwards

let translation = CATransform3DMakeTranslation(4, 0, 0)
topTransform.toValue = NSValue(CATransform3D: CATransform3DRotate(translation, 0.7853975, 0, 0, 1))
topTransform.beginTime = CACurrentMediaTime() + 0.25

self.topLayer.ocb_applyAnimation(topTransform)
}

顶层

相关功能：

func animateCircleToTransparent(completion:()->()) {

let drawAnimation = CABasicAnimation(keyPath: "opacity")
drawAnimation.duration = 0.2
drawAnimation.repeatCount = 1
drawAnimation.fromValue = backgroundCircleOpacity
drawAnimation.toValue = 0
drawAnimation.fillMode = kCAFillModeBackwards
drawAnimation.autoreverses = false
drawAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.34, 0.01, 0.69, 1.37)
self.backgroundCircle.ocb_applyAnimation(drawAnimation)

}

func animateCircleToOpaque(completion:()->()) {

let drawAnimation = CABasicAnimation(keyPath: "opacity")
drawAnimation.duration = 0.2
drawAnimation.repeatCount = 1
drawAnimation.fromValue = 0
drawAnimation.toValue = backgroundCircleOpacity
drawAnimation.fillMode = kCAFillModeBackwards
drawAnimation.autoreverses = false
drawAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.34, 0.01, 0.69, 1.37)
self.backgroundCircle.ocb_applyAnimation(drawAnimation)
}

func animateTopLineOn() {

let topTransform = CABasicAnimation(keyPath: "transform")
topTransform.timingFunction = CAMediaTimingFunction(controlPoints: 0.5, -0.8, 0.5, 1.85)
topTransform.duration = 0.4
topTransform.fillMode = kCAFillModeBackwards

let translation = CATransform3DMakeTranslation(-4, 0, 0)
topTransform.toValue = NSValue(CATransform3D: CATransform3DRotate(translation, -0.7853975, 0, 0, 1))
topTransform.beginTime = CACurrentMediaTime() + 0.25

self.topLayer.ocb_applyAnimation(topTransform)
}


func animateTopLineOff() {


let topTransform = CABasicAnimation(keyPath: "transform")
topTransform.timingFunction = CAMediaTimingFunction(controlPoints: 0.5, -0.8, 0.5, 1.85)
topTransform.duration = 0.4
topTransform.fillMode = kCAFillModeBackwards

let translation = CATransform3DMakeTranslation(4, 0, 0)
topTransform.toValue = NSValue(CATransform3D: CATransform3DRotate(translation, 0.7853975, 0, 0, 1))
topTransform.beginTime = CACurrentMediaTime() + 0.25

self.topLayer.ocb_applyAnimation(topTransform)
}

“CALayer”扩展名：

extension CALayer {
func ocb_applyAnimation(animation: CABasicAnimation) {
let copy = animation.copy() as! CABasicAnimation

if copy.fromValue == nil {
    copy.fromValue = self.presentationLayer()!.valueForKeyPath(copy.keyPath!)
}

self.addAnimation(copy, forKey: copy.keyPath!)
self.setValue(copy.toValue, forKeyPath:copy.keyPath!)
}
}