UINavigationController won't pushViewController

Question

I have two ViewControllers. One is called LoginVC which also is my rootviewcontroller, the other one is named SignUpVC.

In my AppDelegate I have set my UINavigationbar like this:

var window: UIWindow?

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

    window = UIWindow()
    window?.rootViewController = UINavigationController(rootViewController: LoginVC())

    return true
}

then in my LoginVC I use this to get my SignUpVC to show but it doesn't work.

@objc func handleShowSignUp() {
    let signUpVC = SignUpVC()
    navigationController?.pushViewController(signUpVC, animated: true)
}

Can someone please explain to me what I'm doing wrong?

Does the LoginVC display? Not sure if it is just a typo but you also need to add window.makeKeyAndVisible(). Besides that it looks about right. — Alexander
– Alexander, Commented Dec 23, 2019 at 15:47
did you remove storyboard from main storyboard on your .plist ? The lack of self.window?.makeKeyAndVisible() on your appdelegate makes me thing like you are opening default storyboard initial VC, but you think you opened it from didFinishLaunchingWithOptions. — Canberk Ersoy
– Canberk Ersoy, Commented Dec 23, 2019 at 16:03
Thanks for the reply guys! I added window.makeKeyAndVisible() and also removed "Main" from my .plist but it still won't work. — Mattias Törnqvist
– Mattias Törnqvist, Commented Dec 23, 2019 at 16:25

user7396942 · Accepted Answer · 2019-12-23 16:25:04Z

1

you should use the File SceneDelegate, of this manner:

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow? // create Window

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        let LoginVC = ViewController() //create your viewController
        nav.pushViewController(contentView, animated: true) 
               if let windowScene = scene as? UIWindowScene {
                   let window = UIWindow(windowScene: windowScene)
                   window.rootViewController = LoginVC
                   SceneDelegate.window = window
                   window.makeKeyAndVisible()
               }
    }

important: you can check the UIWindowScene

answered Dec 23, 2019 at 16:25

user7396942

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1 Comment

Mattias Törnqvist Over a year ago

I'm doing this for iOS 12, it's part of a tutorial.

Canberk Ersoy · Accepted Answer · 2019-12-23 16:48:29Z

0

Directly initializing LoginVC() and SignUpVC() is kind of wrong. Try something like this if you are using storyboards

let storyboard = UIStoryboard.init(name: "YOUR_STORYBOARD_NAME", bundle: nil)
let nav = storyboard.instantiateInitialViewController() //if you want the initial one

let storyBoard: UIStoryboard = UIStoryboard(name: "YOUR_STORYBOARD_NAME", bundle: nil)
let someVC: SomeViewController = giftStoryBoard.instantiateViewController(withIdentifier: "SomeViewController") as! SomeViewController //don't forget to set identifier on interfacebuilder

If you are using only .xib

let myViewController = MyViewController(nibName: "MyViewController", bundle: nil)

then try to pushing it to navigation controller

answered Dec 23, 2019 at 16:48

Canberk Ersoy

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1 Comment

Mattias Törnqvist Over a year ago

I'm not using Storyboards, trying to do it programmatically.

Mattias Törnqvist · Accepted Answer · 2019-12-23 21:23:32Z

0

This did the trick in the SceneDelegate-file:

    @available(iOS 13.0, *)
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    guard let scene = scene as? UIWindowScene else { return }
    window = UIWindow(windowScene: scene)
    window?.rootViewController = UINavigationController(rootViewController: LoginVC())
    window?.makeKeyAndVisible()
}

answered Dec 23, 2019 at 21:23

Mattias Törnqvist

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