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[英]NavigationView and NavigationLink on button click in SwiftUI?
[英]SwiftUI - Trigger other actions when click NavigationLink
我在上層創建了一個帶有按鈕的列表視圖。 我想在用戶單擊 NavigationLink 后立即隱藏按鈕並且在詳細視圖中看不到它。
我通過使用@State var showAddButton
成功實現它並通過如下所示的onDisappear
和onAppear
操作控制它,但如果主視圖沒有完全消失,按鈕不會消失。
有沒有人有任何其他解決方案來觸發其他操作並保留 NavigationLink 的原始鏈接操作?
@State var showAddButton = true
var body: some View {
ZStack{
NavigationView{
List{
ForEach(items, id: \.id){ item in
NavigationLink(destination: WorkItemDetailView(item: item)){
WorkItemListRow(item: item)
}.onDisappear{self.showAddButton = false}
.onAppear{self.showAddButton = true}
}
}
.navigationBarTitle("List", displayMode: .inline)
}
if showAddButton {
FloatAddButton()
}
}
}
如果您想將該按鈕粘貼到主視圖,您可以切換 ZStack 的 position:
NavigationView{
ZStack{
List{
ForEach(items, id: \.self){ item in
NavigationLink(destination: WorkItemDetailView(item: item)){
WorkItemListRow(item: item)
}
}
}
.navigationBarTitle("List", displayMode: .inline)
Button("mybutton",action: {})}
}
你也可以使用這樣的東西
struct NavigationBlock<Destination: View, Content: View>: View {
@State private var isActive: Bool = false
var destination: Destination
var content: (Binding<Bool>) -> Content
init(destination: Destination, @ViewBuilder content: @escaping (Binding<Bool>) -> Content) {
self.destination = destination
self.content = content
}
var body: some View {
Group {
content($isActive)
NavigationLink(destination: destination,
isActive: $isActive) { Spacer() }.hidden()
}
}
}
用法:
struct ContentView: View {
var body: some View {
NavigationView {
NavigationBlock(destination: Text("Hello")) { binding in
Button(action: {
print("User did tap 'Hello' button")
binding.wrappedValue = true
}) { Text("Hello button") }
}
}
}
}
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