SwiftUI 不更新第二个 NavigationLink 目的地

我有一个列表，其中包含推送视图的行。该视图有另一个列表，它推动另一个视图。原始List和最先推送的List会在数据发生变化时更新。但是，最后一个视图在推送时不会更新。当我向后滑动时，视图不再更新，尽管它曾经更新过。

主页视图 > 用户视图 > 项目视图

用户和项目是可识别的结构。我尝试过使它们可哈希并使用id: \.self，但这似乎也不起作用。

class App: ObservableObject {
    @Published var users = [User]()
}

struct HomeView {

    @EnvironmentObject var app: App

    var body {
        List {
            Section {
                ForEach(app.users) { user in
                    NavigationLink(destination: UserView(user: user)) {
                        Text(user.name)
                    }
                }
            }
        }
    }

}

// Updates fine when `app.users` updates
// Stops updating after going back from ItemView
struct UserView {

    let user: User

    var body {
        List {
            Section {
                ForEach(user.items) { item in
                    NavigationLink(destination: ItemView(user: user, item: item)) {
                        Text(item.name)
                    }
                }
            }
        }
    }

}

/// Does not update when app.users updates
struct ItemView {

    let user: User
    let item: Item

    var body {
        List {
            Section {
                ForEach(item.details) { detail in
                    Text(detail)
                }
            }
        }
    }

}

好吧，我想我开始明白你想要什么了。像这样的事情怎么样：

struct ContentView: View {

@EnvironmentObject var app: App

var body: some View {
    NavigationView {
        List(0..<app.users.count) { i in
            NavigationLink(destination: UserView(user: self.$app.users[i])) {
                Text(self.app.users[i].name)
            }
        }
    }
}


struct UserView: View {
@Binding var user: User
var body: some View {
    List(0..<user.items.count) { i in
            NavigationLink(destination:
            ItemView(item: self.$user.items[i])) {
                Text(self.user.items[i].name)
            }
        }

}
}

struct ItemView: View {
@Binding var item: Item
@State var hasChanged = false
var body: some View {
    VStack {
        Button(action: {
            self.item.details.append(contentsOf: ["wx","wy"])
            self.hasChanged.toggle()
        }) {
            Text("Add an item")
        }
        List(0..<item.details.count, id: \.self) { i in
            Text(self.item.details[i])
        }
    }
}
}