我想将视图控制器设置为初始视图控制器

Question

当用户已经登录时，应用程序应该从主页打开，he/she 不应再次进入登录页面。

我试过这段代码，它没有显示任何错误，但它不起作用。

let token = UserDefaults.standard.string(forKey: "token")  ?? ""
if !token.isEmpty
{
   let storyboard = UIStoryboard(name: "Main", bundle: nil)
   let firstVC = 
                storyboard.instantiateViewController(withIdentifier: 
                "initController") as! ViewController
   self.window?.rootViewController = firstVC
   self.window?.makeKeyAndVisible()
 }

我希望当用户已经登录后，当她再次打开应用时 he/she 必须直接进入主页，不应再次进入登录页面。

Answer 1

let token = UserDefaults.standard.string(forKey: "token") ?? ""
if !token.isEmpty
 {
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    appDelegate.window = UIWindow(frame: UIScreen.main.bounds)
    let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let yourVC = mainStoryboard.instantiateViewController(withIdentifier: 
                     "initController") as! HomeController
    appDelegate.window?.rootViewController = yourVC
    appDelegate.window?.makeKeyAndVisible()
    super.viewDidLoad()
  }

Answer 2

    let rootViewController = self.storyboard?.instantiateViewController(withIdentifier: "rootVcIdentifier") as! UINavigationController

    self.view.window?.rootViewController = rootViewController

我想将视图控制器设置为初始视图控制器

I want to set a view controller as initial view controller

swift4