UIScene userActivity为空

Question

我有一个(催化剂)应用程序，能够有几个窗口。我创建了一个按钮，如果用户按下这个按钮，应用程序就会创建一个新窗口。为了知道需要显示什么视图，我有不同的NSUserActivity activityTypes。在新窗口中应该有一个按钮，可以关闭这个新窗口。问题是，在循环打开的会话时，所有的userActivities都是nil (我需要UIApplication.shared.requestSceneSessionDestruction的正确UISceneSession。

这是我的代码：

struct ContentView: View {
    var body: some View {
        VStack {
            // Open window type 1
            Button(action: {
                UIApplication.shared.requestSceneSessionActivation(nil,
                                                                   userActivity: NSUserActivity(activityType: "window1"),
                                                                   options: nil,
                                                                   errorHandler: nil)
            }) {
                Text("Open new window - Type 1")
            }

            // Open window type 2
            Button(action: {
                UIApplication.shared.requestSceneSessionActivation(nil,
                                                                   userActivity: NSUserActivity(activityType: "window2"),
                                                                   options: nil,
                                                                   errorHandler: nil)
            }) {
                Text("Open new window - Type 2")
            }
        }
    }
}

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)

            if connectionOptions.userActivities.first?.activityType == "window1" {
                window.rootViewController = UIHostingController(rootView: Window1())
            } else if connectionOptions.userActivities.first?.activityType == "window2" {
                window.rootViewController = UIHostingController(rootView: Window2())
            } else {
                window.rootViewController = UIHostingController(rootView: ContentView())
            }
            self.window = window
            window.makeKeyAndVisible()
        }
    }
...

struct Window1: View {
    var body: some View {
        VStack {
            Text("Window1")
            Button("show") {
                for session in UIApplication.shared.openSessions {
                    // this prints two times nil !
                    print(session.scene?.userActivity?.activityType)
                }
            }
        }
    }
}
struct Window2: View {
    var body: some View {
        Text("Window2")
    }
}

Answer 1

我遇到了同样的问题。我最终为每个场景分配了唯一的代理类，并进行了检查。