iOS Login Screen Redirect in Swift

LoginScreenRedirect.swift

func showLoginScreen() {
  DispatchQueue.main.async { [weak self] in
    guard let self = self else { return }
    let frame = UIScreen.main.bounds
    let window = UIWindow(frame: frame)
    window.rootViewController = LoginViewController.instanceFromStoryboard(delegate: self)
    window.makeKeyAndVisible()
    window.alpha = 0
    UIView.animate(withDuration: 0.25) {
      window.alpha = 1
    }
    self.window = window
  }
}