Swiftui 为什么@Binding属性每次都会导致不相关的init？

这是一个让我困惑了一整天的bug，我为我的案例做了一个演示，所有的只是一个列表和一个细节

房间。swift

struct Room: Identifiable {

    var id: Int
    var name: String
}

class RoomListModel: ObservableObject {
    @Published var rooms: [Room] = [
        Room(id: 1, name: "Room A"),
        Room(id: 2, name: "Room B"),
        Room(id: 3, name: "Room C"),
    ]
}

struct RoomList: View {

    @ObservedObject var model = RoomListModel()

    var body: some View {

        NavigationView {
            List {
                ForEach(model.rooms.indices) { index in
                    RoomRow(room: self.$model.rooms[index])
                }
            }
            .listStyle( GroupedListStyle() )
        }
    }
}

struct RoomRow: View {

    @Binding var room: Room

    init(room: Binding<Room>) {
        print("initing RoomRow: " + room.name.wrappedValue)
        self._room = room
    }

    var body: some View {
        NavigationLink(
            destination: RoomDetail(room: $room)
        ) {
            Text(room.name)
        }
    }
}

struct RoomDetail: View {

    @Binding var room: Room

    init(room: Binding<Room>) {
        print("initing RoomDetail: " + room.name.wrappedValue)
        self._room = room
    }

    var body: some View {
        Text(room.name)
    }
}

RoomListModel.swift

struct Room: Identifiable {

    var id: Int
    var name: String
}

class RoomListModel: ObservableObject {
    @Published var rooms: [Room] = [
        Room(id: 1, name: "Room A"),
        Room(id: 2, name: "Room B"),
        Room(id: 3, name: "Room C"),
    ]
}

struct RoomList: View {

    @ObservedObject var model = RoomListModel()

    var body: some View {

        NavigationView {
            List {
                ForEach(model.rooms.indices) { index in
                    RoomRow(room: self.$model.rooms[index])
                }
            }
            .listStyle( GroupedListStyle() )
        }
    }
}

struct RoomRow: View {

    @Binding var room: Room

    init(room: Binding<Room>) {
        print("initing RoomRow: " + room.name.wrappedValue)
        self._room = room
    }

    var body: some View {
        NavigationLink(
            destination: RoomDetail(room: $room)
        ) {
            Text(room.name)
        }
    }
}

struct RoomDetail: View {

    @Binding var room: Room

    init(room: Binding<Room>) {
        print("initing RoomDetail: " + room.name.wrappedValue)
        self._room = room
    }

    var body: some View {
        Text(room.name)
    }
}

RoomList.swift

struct Room: Identifiable {

    var id: Int
    var name: String
}

class RoomListModel: ObservableObject {
    @Published var rooms: [Room] = [
        Room(id: 1, name: "Room A"),
        Room(id: 2, name: "Room B"),
        Room(id: 3, name: "Room C"),
    ]
}

struct RoomList: View {

    @ObservedObject var model = RoomListModel()

    var body: some View {

        NavigationView {
            List {
                ForEach(model.rooms.indices) { index in
                    RoomRow(room: self.$model.rooms[index])
                }
            }
            .listStyle( GroupedListStyle() )
        }
    }
}

struct RoomRow: View {

    @Binding var room: Room

    init(room: Binding<Room>) {
        print("initing RoomRow: " + room.name.wrappedValue)
        self._room = room
    }

    var body: some View {
        NavigationLink(
            destination: RoomDetail(room: $room)
        ) {
            Text(room.name)
        }
    }
}

struct RoomDetail: View {

    @Binding var room: Room

    init(room: Binding<Room>) {
        print("initing RoomDetail: " + room.name.wrappedValue)
        self._room = room
    }

    var body: some View {
        Text(room.name)
    }
}

RoomRow.swift

struct Room: Identifiable {

    var id: Int
    var name: String
}

class RoomListModel: ObservableObject {
    @Published var rooms: [Room] = [
        Room(id: 1, name: "Room A"),
        Room(id: 2, name: "Room B"),
        Room(id: 3, name: "Room C"),
    ]
}

struct RoomList: View {

    @ObservedObject var model = RoomListModel()

    var body: some View {

        NavigationView {
            List {
                ForEach(model.rooms.indices) { index in
                    RoomRow(room: self.$model.rooms[index])
                }
            }
            .listStyle( GroupedListStyle() )
        }
    }
}

struct RoomRow: View {

    @Binding var room: Room

    init(room: Binding<Room>) {
        print("initing RoomRow: " + room.name.wrappedValue)
        self._room = room
    }

    var body: some View {
        NavigationLink(
            destination: RoomDetail(room: $room)
        ) {
            Text(room.name)
        }
    }
}

struct RoomDetail: View {

    @Binding var room: Room

    init(room: Binding<Room>) {
        print("initing RoomDetail: " + room.name.wrappedValue)
        self._room = room
    }

    var body: some View {
        Text(room.name)
    }
}

但是当我触发RowDetail中的一个时，所有的RoomDetails都会被再次初始化，但我只会转到其中一个，而不是所有的，为什么所有的RoomDetails都会被初始化，然后再次

initing RoomDetail: Room C
initing RoomDetail: Room A
initing RoomDetail: Room B

---

我不知道为什么，但找到了一个解决方案，我删除了所有@Binding属性，这没问题，但是为什么

@Binding

会导致未还原的初始化？

无法重现这个问题，使用Xcode 11.0和iOS 13一切都很好。@eloss我刚才检查过，Xcode是11.1，iOS是13.1，我上传了一个演示，请重试。