Getting access to the SceneDelegate window object in Xcode 11. SceneDelegate. Reset application window. Reset window. Reset rootviewcontroller. Root view controller. Scene delegate.

AccessToRootViewController.swift

// accessing the window and changing the root view controller property
override func viewDidLoad() {
  super.viewDidLoad()
  // getting access to the window object from SceneDelegate
  guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
    let sceneDelegate = windowScene.delegate as? SceneDelegate
  else {
    return
  }
  let viewcontroller = UIViewController()
  viewcontroller.view.backgroundColor = .blue
  sceneDelegate.window?.rootViewController = viewcontroller
}

// extension for resetting the window on a UIKit application
extension UIViewController {
  private func resetWindow(with vc: UIViewController?) {
    guard let sceneDelegate = UIApplication.shared.connectedScenes.first?.delegate as? SceneDelegate else {
      fatalError("could not get scene delegate ")
    }
    sceneDelegate.window?.rootViewController = vc
  }
  
  func showViewController(with id: String) {
    let vc = storyboard?.instantiateViewController(identifier: id)
    resetWindow(with: vc)
  }
}

// example case of resetting the window from a login view controller 
// this will transition from a login vc to a navigation controller with the app logic
@IBAction func explore(_ sender: UIButton) {
  showViewController(with: "BBQNavController")
}

@DG0BAB

UIApplication.shared.connectedScenes
            .filter({ $0.activationState == .foregroundActive })
            .compactMap({$0 as? UIWindowScene})

@alexpaul
Value of type 'SceneDelegate' has no member 'window'
Error with code code
// extension for resetting the window on a UIKit application
extension UIViewController {
private func resetWindow(with vc: UIViewController?) {
guard let sceneDelegate = UIApplication.shared.connectedScenes.first?.delegate as? SceneDelegate else {
fatalError("could not get scene delegate ")
}
sceneDelegate.window?.rootViewController = vc
}

func showViewController(with id: String) {
let vc = storyboard?.instantiateViewController(identifier: id)
resetWindow(with: vc)
}
}

error

@2020KamelAlaghbari, window isn't in the UISceneDelegate prototype, but when I create a new project (iOS, Storyboard) using Xcode 13.4.1, the project includes a class called SceneDelegate, that conforms to UIWindowSceneDelegate, that includes a var window: UIWindow?.