如何在SwiftUI中将视图添加到层次结构时设置过渡动画 [英] How to animate transition when adding view to hierarchy in SwiftUI
本文介绍了如何在SwiftUI中将视图添加到层次结构时设置过渡动画的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
iOS 14中的全功能代码。
import SwiftUI
struct ContentView: View {
var body: some View {
Popovers()
}
}
struct Popovers : View {
@State var popovers : [AnyView] = []
var body : some View {
Button("Add a view ...") {
withAnimation {
popovers += [new()]
}
}
.blur(radius: 0 < popovers.count ? 8 : 0)
.overlay(ZStack {
ForEach(0..<self.popovers.count, id: .self) { i in
popovers[i]
.frame(maxWidth: .infinity, maxHeight: .infinity)
.blur(radius: (i+1) < popovers.count ? 8 : 0)
.transition(.move(edge: .trailing)) // works only when popover is removed
}
})
}
func new() -> AnyView {
let popover = popovers.count
return AnyView.init(
VStack(spacing: 64) {
Button("Close") {
withAnimation {
_ = popovers.removeLast()
}
}
.font(.largeTitle)
.padding()
Button("Add") {
withAnimation {
popovers += [new()]
}
}
.font(.largeTitle)
.padding()
Text("This is popover #(popover)")
.font(.title)
.foregroundColor(.white)
.fixedSize()
}
.background(Color.init(hue: 0.65-(Double(3*popover)/100.0), saturation: 0.3, brightness: 0.9).opacity(0.98))
)
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
extension View {
var asAnyView : AnyView {
AnyView(self)
}
}
推荐答案
解决方案是将动画添加到容器中。已在Xcode 12/iOS 14上测试。
struct Popovers : View {
@State var popovers : [AnyView] = []
var body : some View {
Button("Add a view ...") {
withAnimation {
popovers += [new()]
}
}
.blur(radius: 0 < popovers.count ? 8 : 0)
.overlay(ZStack {
ForEach(0..<self.popovers.count, id: .self) { i in
popovers[i]
.frame(maxWidth: .infinity, maxHeight: .infinity)
.blur(radius: (i+1) < popovers.count ? 8 : 0)
.transition(.move(edge: .trailing))
}
}.animation(.default)) // << add animation to container
}
func new() -> AnyView {
let popover = popovers.count
return AnyView.init(
VStack(spacing: 64) {
Button("Close") {
_ = popovers.removeLast()
}
.font(.largeTitle)
.padding()
Button("Add") {
popovers += [new()]
}
.font(.largeTitle)
.padding()
Text("This is popover #(popover)")
.font(.title)
.foregroundColor(.white)
.fixedSize()
}
.background(Color.init(hue: 0.65-(Double(3*popover)/100.0), saturation: 0.3, brightness: 0.9).opacity(0.98))
)
}
}
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