iOS 13: Swift - 'Set application root view controller programmatically' does not work

Question

I have following code in my AppDelegate.swift to setup root view controller for an iOS application. But it does not work. It follows Target structure (defined under General

Answer 1

First Case

If major of your project is build in storyboard and before Xcode 11 is used for development and you are not using SwiftUI you want to use your old classes associated with AppDelegate.

• Then try to remove "Application Scene Manifest" in info.pllist.

• Remove ScenceDelegate from project completely.

  Then you will able to use your old code.

Second Case

If you want to use both Appdelegte and ScenceDelegate then below is working code.

App Delegate Code:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {   
 if #available(iOS 13.0, *){
    //do nothing we will have a code in SceneceDelegate for this 
} else {
    let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let VC = mainStoryboard.instantiateViewController(withIdentifier: "LoginVC") as! LoginVC
    navigationController?.isNavigationBarHidden = true
    navigationController = UINavigationController(rootViewController: VC)
    navigationController?.isNavigationBarHidden = true // or not, your choice.
    self.window = UIWindow(frame: UIScreen.main.bounds)
    self.window!.rootViewController = navigationController
}
return true
}

ScenceDelegate Code:

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

    let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let VC = mainStoryboard.instantiateViewController(withIdentifier: "LoginVC") as! LoginVC
    navigationController?.isNavigationBarHidden = true
    guard let windowScene = (scene as? UIWindowScene) else { return }
    self.window = UIWindow(frame: windowScene.coordinateSpace.bounds)
    window.windowScene = windowScene
    window.rootViewController = VC
    window.makeKeyAndVisible()
    let appDelegate = UIapplication.shared.delegate as! AppDelegate
    appDelegate.window = window
}