UIWindow not showing over content in iOS 13

Question

I am upgrading my app to use the new UIScene patterns as defined in iOS 13, however a critical part of the app has stopped working. I have been using a UI

Answer 1

In addition to the answers about creating a reference to UIWindow and then presenting modally, I've included a section of my code on how I'm dismissing it.

class PresentingViewController: UIViewController {
    private var coveringWindow: UIWindow?

  func presentMovie() {
    let playerVC = MoviePlayerViewController()
    playerVC.delegate = self
    playerVC.modalPresentationStyle = .overFullScreen
    playerVC.modalTransitionStyle = .coverVertical

    self.coverPortraitWindow(playerVC)
  }

  func coverPortraitWindow(_ movieController: MoviePlayerViewController) {

    let windowScene = UIApplication.shared
        .connectedScenes
        .filter { $0.activationState == .foregroundActive }
        .first
    if let windowScene = windowScene as? UIWindowScene {
        self.coveringWindow = UIWindow(windowScene: windowScene)

        let rootController = UIViewController()
        rootController.view.backgroundColor = .clear

        self.coveringWindow!.windowLevel = .alert + 1
        self.coveringWindow!.isHidden = false
        self.coveringWindow!.rootViewController = rootController
        self.coveringWindow!.makeKeyAndVisible()

        rootController.present(movieController, animated: true)
    }
  }

  func uncoverPortraitWindow() {
    guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
        let sceneDelegate = windowScene.delegate as? SceneDelegate
        else {
            return
    }
    sceneDelegate.window?.makeKeyAndVisible()
    self.coveringWindow = nil
  }

}