swift - iOS 13 : Cannot navigate conditionally to a different viewontroller from AppDelegate. swift

Question

我已将登录 View Controller 设置为 Storyboard中的初始 Controller 。但是，当用户有事件 session 时，我想导航到应用程序的主视图 Controller 。这是我所拥有的:

func application(_ application: UIApplication,
                 didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    let sessionToken = "abcedef"

    let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
    if  sessionToken != nil {
        let tabBarVC = storyboard.instantiateViewController(identifier: "TabBarVC")
        tabBarVC.modalPresentationStyle = .fullScreen
        self.window?.rootViewController?.present(tabBarVC, animated: true, completion: nil)
    }
    return true
}

但我仍然看到登录页面。你知道我可能做错了什么吗？

Answer 1

在SceneDelegate.swift

中

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, 
    options connectionOptions: UIScene.ConnectionOptions) {

    let windowScene = UIWindowScene(session: session, connectionOptions: connectionOptions)
    self.window = UIWindow(windowScene: windowScene)

    let sessionToken = "abcedef"

    let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
        if sessionToken != nil {
          let story = UIStoryboard(name: "Main", bundle:nil)
          let vc = story.instantiateViewController(withIdentifier: "InitialController") as! InitialController

          let rootNC = UINavigationController(rootViewController: vc) // As per need
          rootNC.isNavigationBarHidden = true
          self.window?.rootViewController = rootNC
          self.window?.makeKeyAndVisible()
        }
        guard let _ = (scene as? UIWindowScene) else { return }

}

低于 iOS 13 AppDelegate.swift

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
    self.initialRootVC()
    return true
}

func initialRootVC() {
    let story = UIStoryboard(name: "Main", bundle:nil)
    let vc = story.instantiateViewController(withIdentifier: "InitialController") as! InitialController
    let rootNC = UINavigationController(rootViewController: vc). // when require
    rootNC.isNavigationBarHidden = true
    self.window?.rootViewController = rootNC
    self.window?.makeKeyAndVisible()
}