UIScene userActivity is nil

Question

我有一个(Catalyst(应用程序，它可以有几个窗口。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。要知道需要显示什么View，我有不同的NSUserActivityactivityTypes。在新窗口中应该有一个按钮，可以关闭这个新窗口。问题是，在打开的会话中循环时，所有userActivities都是nil(并且我需要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。我最终为每个场景指定了唯一的代理类，并进行了检查。