ios - 如何从 onContinueUserActivity 更改 WindowGroup 视图？

Question

我有一个深层链接的应用程序，所以首先我渲染了一个加载或主页视图：

@main
struct AppMain: App {
    
    var body: some Scene {
        WindowGroup {
            LoadingView()
                .onContinueUserActivity(NSUserActivityTypeBrowsingWeb, perform: handleUserActivity)
        }
    }
}

但是，在我handleUserActivity响应活动的情况下，如何根据活动参数更新屏幕？例如，我提取了一个值并想从这里渲染视图：

private extension AppMain {
    
    func handleUserActivity(_ userActivity: NSUserActivity) {
        guard let url = userActivity.webpageURL,
              let components = NSURLComponents(url: url, resolvingAgainstBaseURL: true),
              let queryItems = components.queryItems
        else {
            return
        }
        
        if let modelID = queryItems.first(where: { $0.name == "id" })?.value {
            SmoothieView(id: modelID) // TODO: How to I render view??
        }
    }
}

如何替换LoadingView并显示SmoothieView？

Answer 1

这是一种可能的方法 - 在顶视图中使用应用程序状态对象和观察者根据状态进行切换。

（注意：代码是输入到位的，所以可能是拼写错误）

class AppState: ObservableObject {
   @Published var modelID: String?
}

@main
struct AppMain: App {
    @StateObject var appState = AppState()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(appState)
                .onContinueUserActivity(NSUserActivityTypeBrowsingWeb, perform: handleUserActivity)
        }
    }
}

private extension AppMain {
    
    func handleUserActivity(_ userActivity: NSUserActivity) {
        guard let url = userActivity.webpageURL,
              let components = NSURLComponents(url: url, resolvingAgainstBaseURL: true),
              let queryItems = components.queryItems
        else {
            return
        }
        
        if let modelID = queryItems.first(where: { $0.name == "id" })?.value {

            self.appState.modelID = modelID // << here !!

        }
    }
}

// as soon as you receive model id the view will be refreshed
struct ContentView: View {
   @EnvironmentObject var appState: AppState

   var body: some View {
      if appState.modelID == nil {
         LoadingView()
      } else {
         SmoothieView(id: appState.modelID!)
      }
   }
}