C# Xamarin.iOS：启动后黑屏，无情节提要

我不想在我的Xamarin.iOS应用程序中使用情节提要，因此我做了以下操作：

1-删除情节提要文件

2-将plist.info文件应用程序>主界面更新为无值

3-将以下代码添加到

AppDelegate

文件中

[Export ("application:didFinishLaunchingWithOptions:")]
public bool FinishedLaunching (UIApplication application, NSDictionary launchOptions)
{
    // create a new window instance based on the screen size
    Window = new UIWindow(UIScreen.MainScreen.Bounds);

    var controller = new UIViewController();
    controller.View.BackgroundColor = UIColor.LightGray;
    controller.Title = "My Controller";

    var navController = new UINavigationController(controller);

    Window.RootViewController = navController;

    // make the window visible
    Window.MakeKeyAndVisible();

    return true;
}

但这样做后，我收到了一个黑屏上的模拟器后，发射屏幕完成。即使是全新的项目也会出现这种情况。我上传了一个带有这些步骤和问题的示例新项目

我使用的是Visual Studio 2019-Xamarion.iOS 11.8.3-XCode 11.3

我最近使用Visual Studio 2015时没有任何问题，我认为这个问题只发生在Visual Studio 2019上。不幸的是，目前我没有Visual Studio 2015可供试用。

从iOS 13开始，负责设置应用程序的场景，将代码从

AppDelegate

移动到

SceneDelegate

：

[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 controller = new UIViewController();
    controller.View.BackgroundColor = UIColor.LightGray;
    controller.Title = "My Controller";

    UINavigationController navigationMain = new UINavigationController(controller);
    Window.RootViewController = navigationMain;
    Window.MakeKeyAndVisible();
}

请参阅：从iOS 13开始，负责设置应用程序的场景，将代码从

AppDelegate

移动到

SceneDelegate

：

[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 controller = new UIViewController();
    controller.View.BackgroundColor = UIColor.LightGray;
    controller.Title = "My Controller";

    UINavigationController navigationMain = new UINavigationController(controller);
    Window.RootViewController = navigationMain;
    Window.MakeKeyAndVisible();
}

参考：及