[英]SwiftUI: Using @Binding to dismiss a modal view not working
我将@State
var 传递给几个视图,在子视图上使用@Binding
,当我最终将变量设置回false 时,有时我的视图不会关闭。
似乎我可以运行articleDisplayed.toggle()
但如果我在上方或下方运行额外的 function,它将无法正常工作。
知道这里发生了什么吗?
这是我的代码:
struct HomeView: View {
@EnvironmentObject var state: AppState
@State var articleDisplayed = false
// MARK: - Body
var body: some View {
NavigationView {
ZStack {
List {
ForEach(state.cards, id: \.id) { card in
Button(action: {
self.articleDisplayed = true // I set it to true here
self.state.activeCard = card
}) {
HomeCell(
card: card,
publicationColor: self.state.publication.brandColor
)
}.sheet(isPresented: self.$articleDisplayed) {
SafariQuickTopicView(articleDisplayed: self.$articleDisplayed)
.environmentObject(self.state)
.environment(\.colorScheme, .light)
}
}
}
}
}
}
}
然后在我的SafariQuickTopicView
中:
struct SafariQuickTopicView: View {
@Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
@EnvironmentObject var state: AppState
@Binding var articleDisplayed: Bool
var body: some View {
NavigationView {
ZStack(alignment: .bottom) {
// doesn't matter what's in here
}
.navigationBarItems(trailing: passButton)
}
}
private var passButton: some View {
Button(action: self.state.pass {
DispatchQueue.main.async {
// self.state.removeActiveCardFromState()
self.articleDisplayed.toggle() // this will work but adding a second function in here prevents it from working, above or below the toggle.
}
}
}) {
Text("Pass")
}
}
最后,在我的AppState
中:
func pass(completion: () -> Void) { // need completion?
guard let activeCard = activeCard else { return }
if let index = cards.firstIndex(where: { $0.id == activeCard.id }) {
activeCard.add(comment: "pass")
rejectCurrentCard() // Does an async operation with an external API but we don't care about the result
addRemovedActiveCardToUserDefaults()
completion()
}
}
将.sheet
移出列表,它必须是每个视图层次结构一个,所以像
List {
ForEach(state.cards, id: \.id) { card in
Button(action: {
self.articleDisplayed = true // I set it to true here
self.state.activeCard = card
}) {
HomeCell(
card: card,
publicationColor: self.state.publication.brandColor
)
}
}
}
.sheet(isPresented: self.$articleDisplayed) {
SafariQuickTopicView(articleDisplayed: self.$articleDisplayed)
.environmentObject(self.state)
.environment(\.colorScheme, .light)
}
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