[英]SwiftUI animation with switch statement
我了解简单动画在 SwiftUI 中的工作原理。 但是,我有一个稍微复杂的 watchOS 应用程序。 查看 state 由switch
语句处理:
struct ContentView: View {
@EnvironmentObject private var state: AppState
@State private var selection = 1
var body: some View {
Group {
switch state.view {
case .start:
TabView(selection: $selection) {
ActivityView()
.tag(0)
StartView()
.tag(1)
SettingsView()
.tag(2)
}
case .workout:
TabView(selection: $selection) {
TakeoffControlView()
.tag(0)
TakeoffView()
.tag(1)
}
}
// ...
}
}
}
在另一个视图中,我编辑视图 state:
struct StartView: View {
@EnvironmentObject private var state: AppState
var body: some View {
Button(action: {
state.view = .workout
}, label: {
Text("Start")
})
}
}
如何添加动画以在不同情况之间转换? 我尝试将 animation 添加到Group
、 TabView
和单个视图但没有成功。 显然,我将 state 更改包装在withAnimation
中。 但是,我无法使其工作。 任何想法如何使这项工作?
.transition()
只是定义过渡是什么,并且要获得预期的过渡 animation,您必须在withAnimation() {... }
块中对SourceOfTruth
进行更改。
struct ContentView: View {
@EnvironmentObject private var state: AppState
@State private var selection = 1
var body: some View {
Group {
switch state.view {
case .start:
TabView(selection: $selection) {
ActivityView()
.tag(0)
StartView()
.tag(1)
SettingsView()
.tag(2)
}
.transition(.slide)//<- here
case .workout:
TabView(selection: $selection) {
TakeoffControlView()
.tag(0)
TakeoffView()
.tag(1)
}
.transition(.slide)//<- here
}
// ...
}
}
}
struct StartView: View {
@EnvironmentObject private var state: AppState
var body: some View {
Button(action: {
withAnimation(.easeIn) { //<- here
state.view = .workout
}
}, label: {
Text("Start")
})
}
}
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