ios - 不显示来自 AppDelegate 的第一个 ViewController

Question

我有一个内部漆成红色的 UIViewController，我想将此 viewController 视为第一个屏幕，但从未从 ViewController 开始，我做错了什么？

UIWindow window;
        [Export("window")]
        public UIWindow Window { get; set; }

        [Export("application:didFinishLaunchingWithOptions:")]
        public bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
        {
            window = new UIWindow(UIScreen.MainScreen.Bounds);
            View view = new View();
            UINavigationController navigationMain = new UINavigationController(view);


            window.MakeKeyAndVisible();
            window.RootViewController = navigationMain;
            return true;
        }

我收到这个错误:

 Proyect[4195:115403] SecTaskLoadEntitlements failed error=22 cs_flags=200, pid=4195
 Proyect[4195:115403] SecTaskCopyDebugDescription: Proyect[4195]/0#-1 LF=0
 Proyect[4195:115403] SecTaskLoadEntitlements failed error=22 cs_flags=200, pid=4195
 Proyect[4195:115403] SecTaskCopyDebugDescription: Proyect[4195]/0#-1 LF=0

Answer 1

On iOS 13 (and up), the scene delegate takes over some of the roles of the app delegate. Most importantly, the concept of a window is replaced by that of a scene. An app can have more than one scene, and a scene now serves as the backdrop for your app’s User Interfaces and content.

从 iOS 13 开始，SceneDelegate负责设置您应用的场景，以及设置他们的初始 View 。

[Export ("scene:willConnectToSession:options:")]
public void WillConnect (UIScene scene, UISceneSession session, UISceneConnectionOptions connectionOptions)
{
    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
    // This delegate does not imply the connecting scene or session are new (see UIApplicationDelegate `GetConfiguration` instead).

    UIWindowScene myScene = scene as UIWindowScene;
    Window = new UIWindow(myScene);
    UIViewController viewController = new UIViewController();
    UINavigationController navigationMain = new UINavigationController(viewController );
    Window.RootViewController = navigationMain;
    Window.MakeKeyAndVisible();
}

更多信息，您可以阅读this article和 watch the official video of Optimizing App Launch in iOS13