SwiftUI navigationBarBackButtonHidden 未按预期工作

我有一个问题navigationBarBackButtonHidden修饰符。它不会隐藏导航后退按钮...

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 a preview:

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:

“

我通过将列表的代码更新为：

NavigationLink(destination: ChatView(chat: chat).navigationBarBackButtonHidden(true)) {
    ChatRow(chat: chat)
}

然而，顶部和下一个视图的标题之间仍然存在巨大差距：

应该只有一个NavigationView在一个导航堆栈上，所以

struct ChatView: View {
    ...
    var body: some View {
        NavigationView { // << NavigationView not needed here !!!

删除标记的导航视图应该可以工作。

使用 Xcode 11.2、iOS 13.2 进行测试