[英]Is it possible to animate view on a certain Path in SwiftUI
Is it possible to animate view on a certain Path in SwiftUI.是否可以在 SwiftUI 中为特定路径上的视图设置动画。 Previous to SwiftUI it was just a matter of setting path property of its layer.
在 SwiftUI 之前,它只是设置其图层的路径属性的问题。 How can I do something similar now?
我现在怎么做类似的事情?
EDIT Here is an example how i did it with UIKit编辑这是我如何用 UIKit 做的一个例子
let path = UIBezierPath(arcCenter: center, radius: radius, startAngle: startAngle, endAngle: endAngle, clockwise: true)
let animation = CAKeyframeAnimation(keyPath: #keyPath(CALayer.position))
animation.duration = CFTimeInterval(duration)
animation.repeatCount = 1
animation.path = path.cgPath
animation.isRemovedOnCompletion = true
animation.fillMode = .forwards
animation.timingFunction = CAMediaTimingFunction(name: .linear)
viewToAnimate.layer.add(animation, forKey: "someAnimationName")
Yes, it is possible.对的,这是可能的。 Here is a demo of possible approach (scratchy, many parameters just hardcoded, but the could be configured via properties, constructor, callbacks, etc.)
这是一个可能的方法的演示(粗糙,许多参数只是硬编码,但可以通过属性、构造函数、回调等进行配置)
struct PathAnimatingView<Content>: UIViewRepresentable where Content: View {
let path: Path
let content: () -> Content
func makeUIView(context: UIViewRepresentableContext<PathAnimatingView>) -> UIView {
let view = UIView(frame: .zero)
view.translatesAutoresizingMaskIntoConstraints = false
view.layer.borderColor = UIColor.red.cgColor
view.layer.borderWidth = 2.0
let animation = CAKeyframeAnimation(keyPath: #keyPath(CALayer.position))
animation.duration = CFTimeInterval(3)
animation.repeatCount = 3
animation.path = path.cgPath
animation.isRemovedOnCompletion = false
animation.fillMode = .forwards
animation.timingFunction = CAMediaTimingFunction(name: .linear)
let sub = UIHostingController(rootView: content())
sub.view.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(sub.view)
sub.view.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
sub.view.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
view.layer.add(animation, forKey: "someAnimationName")
return view
}
func updateUIView(_ uiView: UIView, context: UIViewRepresentableContext<PathAnimatingView>) {
}
typealias UIViewType = UIView
}
struct TestAnimationByPath: View {
var body: some View {
VStack {
PathAnimatingView(path: Circle().path(in:
CGRect(x: 100, y: 100, width: 100, height: 100))) {
Text("Hello, World!")
}
}
}
}
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