Scene Delegate with Programmatic UINavigationController

SceneDelegate.swift

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

  var window: UIWindow?

  func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.

    // 1. Create named variable for the window scene.
    guard let windowScene = (scene as? UIWindowScene) else { return }
    
    // 2. Set class `window` property to newly created window that is associated to the `windowScene` object. 
    window = UIWindow(windowScene: windowScene)
    
    // 3. Instnatiate your view controller and designate it as the root view controller of a newly instantiated navigation controller. 
    let rootViewController = RootViewController()
    let navigationController = UINavigationController(rootViewController: rootViewController)
    
    // 4. Designate the navigation controller as the root view controller of the window. 
    window?.rootViewController = navigationController
    
    // 5. Set window as the key window and show window. 
    window?.makeKeyAndVisible()
    
  }
  /*
  .
  .
  .
  */
}