ios - Swift - 在 AppDelegate 中实例化 View Controller

Question

我试图让我的登录页面从 AppDelegate.swift 的初始 View Controller 上弹出，并且我正在使用
let authVC = Storybaord.instantiateViewController(withIdentifier: "StartVC")
来实例化它。但是， View Controller 链接到导航 Controller ，当我使用代码时，当我单击 View Controller 的按钮时，它会使应用程序崩溃。代码:

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 storybaord = UIStoryboard(name: "Main", bundle: Bundle.main)
        let authVC = storybaord.instantiateViewController(withIdentifier: "StartVC")
        window?.makeKeyAndVisible()
        window?.rootViewController?.present(authVC, animated: false, completion: nil)
    }
    return true
}

在 Main.Storyboard 文件中，我在导航 Controller 的第一个 View Controller 上有 Storyboard ID ("StartVC")。屏幕截图:http://prntscr.com/lp8fez | http://prntscr.com/lp8flq

这是崩溃日志:
由于未捕获的异常“NSGenericException”而终止应用程序，原因:“无法找到用于 segue 'toName' 的导航 Controller 。仅当源 Controller 由 UINavigationController 实例管理时才能使用推送 Segue。

Answer 1

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
FirebaseApp.configure()
if Auth.auth().currentUser == nil {
    let storybaord = UIStoryboard(name: "Main", bundle: Bundle.main)
    let authVC = storybaord.instantiateViewController(withIdentifier: "StartVC")


    window?.rootViewController?= authVC

                 window?.makeKeyAndVisible()
}
return true
}

我已经使用了这段代码并且它对我有用。如果需要更多帮助，请尝试告诉我。