swift - 在 AppDelegate 中设置初始 View Controller 时完全黑屏

Question

我想做的就是在用户= nil 的情况下进入登录屏幕。否则，它将转到应用程序的主/主页部分，其中包含选项卡栏 Controller 的第一个 View Controller

这是我的应用程序委托(delegate):

import UIKit
import Firebase

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    FirebaseApp.configure()
    let storyboard = UIStoryboard(name: "Main", bundle: nil)

    if Auth.auth().currentUser == nil && !UserDefaults.standard.bool(forKey: "hasViewedWalkthrough") {

        let initialViewController = storyboard.instantiateViewController(withIdentifier: "WalkthroughViewController") as? WalkthroughViewController
        self.window?.rootViewController = initialViewController


    } else if Auth.auth().currentUser == nil && UserDefaults.standard.bool(forKey: "hasViewedWalkthrough") {

        let initialViewController = storyboard.instantiateViewController(withIdentifier: "loginViewController") as? LoginViewController
        self.window?.rootViewController = initialViewController

    } else {

        let initialViewController = storyboard.instantiateViewController(withIdentifier: "homeTabBarController") as? MainTabBarViewController
        self.window?.rootViewController = initialViewController

    }

    self.window?.makeKeyAndVisible()
    return true
}

我无法进入入门或登录屏幕。我总是被引导到主屏幕。我知道如果我手动将它们设置为 Storyboard中的初始 View Controller ，屏幕渲染得很好。

我尝试了多种解决方案，但没有一个有效。

更新

Answer 1

试试这个:

let storyBoard = UIStoryboard(name: "Main", bundle: nil)
        let initialViewController = storyBoard.instantiateViewControllerWithIdentifier("homeTabBarController") as? TabBarViewController // whatever your swift file is called 
        self.window?.rootViewController = storyBoard

对 if 语句的每个语句使用该代码，显然将 View Controller 的名称分别更改为登录 Controller 。