Ios UIViewController未从AppDelegate显示

如果用户尚未实例化，我尝试在ViewController中显示注册/登录，但由于某些原因，ViewController不想显示自己，它显示的是一个没有任何内容的黑色页面。这是我的

AppDelegate.swift

文件中的内容，如果用户还没有注册（我还没有注册），它应该显示ViewController。我在VC的

ViewDidLoad（）

中设置了一个断点，该断点没有命中。有人知道出了什么问题吗

var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        FirebaseApp.configure()

        if Auth.auth().currentUser == nil {
            let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
            let authVC = storyboard.instantiateViewController(identifier: "AuthVC")
            window?.makeKeyAndVisible()
            window?.rootViewController?.present(authVC, animated: true, completion: nil)

        }
        return true
    }

---

如果删除了场景代理，则需要先创建窗口，然后再向其显示任何内容

window  = UIWindow(frame: UIScreen.main.bounds)
if let window = window {
window.rootViewController = UIViewController()
window.makeKeyAndVisible()
window.rootViewController?.present(authVC, animated: true, completion: nil)
}

为现场大使

 func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.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 `application:configurationForConnectingSceneSession` instead).
     guard let windowScene = (scene as? UIWindowScene) else { return }

     window = UIWindow(windowScene: windowScene)
     let navigationController = UINavigationController(rootViewController: UIViewController()) // instead of UIViewController() give it your application root controller... which you want to show when you dismiss presented controller 
     window?.rootViewController = navigationController  
     window?.makeKeyAndVisible()
     window?.rootViewController?.present(authVC, animated: true, completion: nil)
    }

---

您的

rootViewController

可能

nil

，在if语句中设置断点。是否有场景委托类？是的，在这种情况下，您负责分配根视图控制器。这可能是一个包含

authVC

的导航控制器，也可能是

authVC

本身，具体取决于您登录后所做的操作。rootViewController确实是nilI deleted SceneDelegate，因为我读到它可能会干扰窗口。makeyeandvisible（）函数viewdiload触发，但是实际的ViewController没有显示，你知道为什么吗？我添加了SceneDelegate，其didload名为？AuthVC，我想显示的VC，但它实际上没有显示VC，它只是转到我的初始VC]所以你现在使用场景代理或应用程序代理？