问题描述
感谢@matt，我不久前了解到可以在 lateinit var searchArgument: String
override fun onCreateView(inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?): View? {
// Inflate the layout for this fragment
val root = inflater.inflate(R.layout.fragment_search,container,false)
searchArgument = activity?.intent?.extras?.getString("searchArgument").toString()
Log.d("eeee",searchArgument) // retuning null in Logcat
return root
}
中为多个图层的属性设置动画。诀窍是为子层添加名称。
有关该技术的讨论，请参阅 Matt 在 this thread 中的回答，以及我编写的用于测试它的工作示例。
然后将动画组添加到父层，并在影响父层子层的动画中，使用 CAAnimationGroup 值创建这些子层动画，该值将子层引用为子层的命名子层父层。
所以如果我有 CAShapeLayer keyPath，它也有一个名为“sublayer”的子层，
parentLayer我想创建一个动画组，同时为父层和子层的属性设置动画，代码可能如下所示：
let parentLayer = CAShapeLayer()
let sublayer = CAShapeLayer()
sublayer.name = "sublayer"
parentLayer.addSublayer(sublayer)
上面的代码不起作用。 问题似乎特别在于尝试为子图层的路径设置动画。如果我改为为子图层的旋转设置动画，请使用如下代码：
let animationGroup = CAAnimationGroup()
animationGroup.duration = animationDuration
let parentLayerAnimation = CABasicAnimation(keyPath: "path")
parentLayerAnimation.duration = animationDuration
parentLayerAnimation.fromValue = parentLayer.path
parentLayerAnimation.tovalue = newPath
let sublayerAnimation = CABasicAnimation(keyPath: "sublayers.sublayer.path")
sublayerAnimation.duration = animationDuration
sublayerAnimation.fromValue = subLayer.path
sublayerAnimation.tovalue = newSublayerPath
let animationGroup = CAAnimationGroup()
animationGroup.duration = animationDuration
animationGroup.animations = [parentLayerAnimation,sublayerAnimation]
parentLayer.add(animationGroup,forKey: nil)
然后将 let sublayerRotationAnimation = CABasicAnimation(keyPath: "sublayers.sublayer.transform.rotation.z")
sublayerRotationAnimation.duration = animationDuration
sublayerRotationAnimation.fromValue = 0
sublayerRotationAnimation.tovalue = CGFloat.pi
添加到动画组， 起作用。
如果我尝试为子图层的路径设置动画，问题似乎就会发生。为其他属性设置动画。
（如果我将子图层动画的关键路径更改为“路径”并将动画直接添加到子图层，那也可以。）
我追求的效果是这样的：
（动画成圆弧的黑色插入符号是父层，带点的红线是子层sublayerRotationAnimation。）
我在 Github 上有一个工作项目的分支来说明这个问题：
Github project branch with animation group that doesn't work
main branch of the project 只是将单独的动画提交给层和子层，这很有效。
该分支中尝试添加动画组的代码位于 CaretToArcView.swift 文件中：
bezierIllustrationLayer据我所知，这是 CAAnimationGroup 中的一个错误。如果我将其直接应用于子层（在适当更改 keyPath 之后），则相同的动画会起作用。不同属性的动画（如子层的 let pathAnimation = CABasicAnimation(keyPath: "path")
pathAnimation.duration = animationDuration
pathAnimation.timingFunction = camediatimingFunction(name: camediatimingFunctionName.easeInEaSEOut)
pathAnimation.fromValue = layer.path
pathAnimation.tovalue = path.cgPath
// This animation does not work when added to an animation group applied to the parent layer of the bezierIllustrationLayer
let bezierPathAnimation = CABasicAnimation(keyPath: "sublayers.bezierillustrationlayer.path")
bezierPathAnimation.duration = animationDuration
bezierPathAnimation.timingFunction = camediatimingFunction(name: camediatimingFunctionName.easeInEaSEOut)
bezierPathAnimation.fromValue = bezierIllustrationLayer.path
bezierPathAnimation.tovalue = illustrationPath.cgPath
//If I add this rotation animation to the animation group,it works
//let rotationAnimation = CABasicAnimation(keyPath: "sublayers.bezierillustrationlayer.transform.rotation.z")
//rotationAnimation.duration = 1.0
//rotationAnimation.timingFunction = camediatimingFunction(name: camediatimingFunctionName.easeInEaSEOut)
//rotationAnimation.fromValue = 0
//rotationAnimation.tovalue = CGFloat.pi * 2
let animationGroup = CAAnimationGroup()
animationGroup.duration = animationDuration
animationGroup.timingFunction = camediatimingFunction(name: camediatimingFunctionName.easeInEaSEOut)
animationGroup.animations = [pathAnimation,bezierPathAnimation]
layer.add(animationGroup,forKey: nil)
dispatchQueue.main.asyncAfter(deadline: .Now() + 0.1) {
layer.path = path.cgPath
self.bezierIllustrationLayer.path = illustrationPath.cgPath
}
）在动画组中工作。它只是为失败的子层路径设置动画。
有没有其他人遇到过这种情况，您有解决方案吗？马特？我认为您是这里 CAAnimation 的权威专家。你能帮忙吗？
解决方法
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