[英]SwiftUI navigationBarBackButtonHidden not working as expected
I'm having an issue with the navigationBarBackButtonHidden
modifier.我遇到了navigationBarBackButtonHidden
修饰符的问题。 It doesn't hide the navigation back button...它不会隐藏导航后退按钮...
Here's the source code for the list:这是列表的源代码:
import SwiftUI
struct ContentView: View {
@State var showSheet = false
var body: some View {
NavigationView {
List(chatsData, id: \.self.id) { chat in
NavigationLink(destination: ChatView(chat: chat)) {
ChatRow(chat: chat)
}
}
.navigationBarTitle("Chats")
}
}
}
Here's the code for the view I wish to hide the "default" back button:这是我希望隐藏“默认”后退按钮的视图的代码:
import SwiftUI
struct ChatView: View {
var chat: Chat
@Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
@State var name: String = "Some text"
fileprivate var backButton: some View {
Button(action: {
self.presentationMode.wrappedValue.dismiss()
}, label: {
Image(systemName: "chevron.left")
})
}
var body: some View {
NavigationView {
VStack(alignment: .leading, spacing: 0) {
Spacer()
TextField("Name's placeholder", text: $name)
.clipShape(Rectangle())
.overlay(Rectangle().stroke(Color("lightgray"), lineWidth: 2))
.lineLimit(5)
}
.navigationBarBackButtonHidden(true)
.navigationBarItems(leading: backButton)
.navigationBarTitle("\(chat.id)", displayMode: .inline)
}
}
}
However, when clicking on a list item from the 1st screenshot, here's what I get:但是,当单击第一个屏幕截图中的列表项时,我得到的是:
The "< Chats" back button is still there. “<聊天”后退按钮仍然存在。
I've managed to hide it by updating the code of the List to:我设法通过将 List 的代码更新为以下内容来隐藏它:
NavigationLink(destination: ChatView(chat: chat).navigationBarBackButtonHidden(true)) {
ChatRow(chat: chat)
}
However there's still a huge gap between the top and the title of the next view:然而,顶部和下一个视图的标题之间仍然存在巨大差距:
There should be only one NavigationView
on one navigation stack, so一个导航堆栈上应该只有一个NavigationView
,所以
struct ChatView: View {
...
var body: some View {
NavigationView { // << NavigationView not needed here !!!
remove marked navigation view and should work.删除标记的导航视图,应该可以工作。
Tested with Xcode 11.2, iOS 13.2使用 Xcode 11.2、iOS 13.2 测试
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