小编Vku*_*ans的帖子

基本上我试图弄清楚我的 viewModel 何时更新，它会通知视图并刷新整个身体。如何避免这种情况。例如，如果我的视图 GoLiveView 已经呈现另一个视图 BroadcasterView，然后我的 goLiveViewModel 得到更新，GoLiveView 将被刷新，它会再次创建 BroadcasterView，因为 showBroadcasterView = true。正因为如此，它会在未来引起很多问题。

struct GoLiveView: View {

@ObservedObject var goLiveViewModel = GoLiveViewModel()
@EnvironmentObject var sessionStore: SessionStore
@State private var showBroadcasterView = false
@State private var showLiveView = false

init() {
    goLiveViewModel.refresh()
}

var body: some View {
    NavigationView {
        List(goLiveViewModel.rooms) { room in // when goLiveViewModed get updated 
            NavigationLink(destination: LiveView(clientRole: .audience, room: room, showLiveView: $showLiveView))) {
                LiveCell(room: room)

            }
        }.background(Color.white)
        .navigationBarTitle("Live", displayMode: .inline)
        .navigationBarItems(leading:
            Button(action: {
                self.showBroadcasterView = true
        }, …