How to use old method of setting rootViewController in AppDelegate using Swift

Question

I just started a new project of iOS. I created the project using xcode 11 and iOS 13. When I created project i found out that in order to set our own rootController we have to use sceneDelegate instead of AppDelegate. I want to ask if there is any possibility to use old method of setting rootControllers in AppDelegate instead of using sceneDelegate.

 import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {


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

        let loginController: HomeViewController = HomeViewController(nibName: "HomeViewController", bundle: nil)

       //        let navController: UINavigationController = UINavigationController(rootViewController: loginController)
               self.window?.rootViewController = loginController
               self.window?.makeKeyAndVisible()
        // Override point for customization after application launch.
        return true
    }
}

do you have a seperate nib file for your `HomeViewController `or its in `Main.Stroyboard`? — Keshu R., Jan 28 '20 at 13:11

Keshu R. · Accepted Answer · 2020-01-28T13:22:28.460

3

Follow these steps to use AppDelegate and opt-out for SceneDelegate

Go to Info.plist and remove Application Scene Manifest entry from Info.plist.
Remove SceneDelegate.swift
Add var window: UIWindow? in your AppDelegate.swift file

Delete the UISceneSession Lifecycle code from AppDelegate.swift

import UIKit

@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.
     let mainStoryBoard = UIStoryboard(name: "Main", bundle: Bundle.main)
     let loginController = mainStoryBoard.instantiateViewController(withIdentifier: "HomeViewController")
     self.window?.rootViewController = loginController
     self.window?.makeKeyAndVisible()
     return true
}
}

Make sure to give "HomeViewController" storyboardID to your view controller.

This is how your AppDelegate.swift file should look now. You are good to go!

edited Jan 28 '20 at 13:22

answered Jan 28 '20 at 12:52

Keshu R.

5,045
1
18
38

I followed you steps but it shows black screen now. – Hasnain ahmad Jan 28 '20 at 12:54
have you set the root view controller? – Keshu R. Jan 28 '20 at 12:56
yes I have set rootController – Hasnain ahmad Jan 28 '20 at 12:58
@hussnainahmad Also delete `UISceneSession Lifecycle` methods from `AppDelegate.swift` – iOSDev Jan 28 '20 at 12:59
i also deleted that but still black screen – Hasnain ahmad Jan 28 '20 at 13:00
@hussnainahmad Do you see any error in console? – iOSDev Jan 28 '20 at 13:01
@hussnainahmad i just tried it. created a new project and followed the above steps. and everything works fine. I have also updated the answer – Keshu R. Jan 28 '20 at 13:03
@KeshuR. I just edited my question please check my appDelegate – Hasnain ahmad Jan 28 '20 at 13:08
@KeshuR. i am not using storyBoard i am using nib for my homeViewController – Hasnain ahmad Jan 28 '20 at 13:26
If you are not using storyboard, then you need to remove "Main storyboard file base name" from your plist. – Shahrukh Malik Jan 28 '20 at 13:54
@hussnainahmad remove "Main storyboard file base name" from your plist – Keshu R. Jan 28 '20 at 14:10

Harshal Valanda · Answer 2 · 2020-01-28T13:23:08.907

1

If you don't want to use sceneDelegate then you can remove all sceneDelegate and also remove 'Application Scene Manifest' from info.plist

set UIWindow variable

var window: UIWindow?

Make sure you have removed Application Scene Manifest this from info.plist and change the background colour of your view controller.

Your device's Dark Mode is enable if you want to remove dark mode from app add this key into your info.plist

User Interface Style = Light

edited Jan 28 '20 at 13:23

answered Jan 28 '20 at 12:53

Harshal Valanda

5,331
26
63

i did that but it shows. black screen now. – Hasnain ahmad Jan 28 '20 at 12:56
your device set dark mode right? remove the dark mode else change the colour of your view controller @hussnainahmad – Harshal Valanda Jan 28 '20 at 13:17
No i am using a simulator. and i think its not on dark mode – Hasnain ahmad Jan 28 '20 at 13:31
Ok check this also Application Scene Manifest. i have created new project and follow all step it's working – Harshal Valanda Jan 28 '20 at 13:39

score 1 · Answer 3 · answered Jan 28 '20 at 13:00

Why don't you use the SceneDelegate

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
            guard let windowScene = (scene as? UIWindowScene) else { return }
            self.window = UIWindow(frame: windowScene.coordinateSpace.bounds)
           //Make sure to do this else you won't get 
           //the windowScene object using UIApplication.shared.connectedScenes
            self.window?.windowScene = windowScene 
            let storyBoard: UIStoryboard = UIStoryboard(name: storyBoardName, bundle: nil)
            window?.rootViewController = storyBoard.instantiateInitialViewController()
            window?.makeKeyAndVisible()
        }

because we have a pattern to follow in our app. that pattern is forced by our company — Hasnain ahmad, Jan 28 '20 at 13:02

How to use old method of setting rootViewController in AppDelegate using Swift

3 Answers3