Alert.swift

func userTapDialog {

  // Create the alert
  let alertControl = UIAlertController(
        title: "Question!",
        message: "What's your favourite color?",
        preferredStyle: .alert
      )
  
  // add the red action
  alertControl.addAction(UIAlertAction(title: "Red", style: .default, handler: { [weak self] _ in
    self?.localState.color = "Red"
  }))

  // add the blue action
  alertControl.addAction(UIAlertAction(title: "Blue", style: .default, handler: { [weak self] _ in
    self?.localState.color = "Blue"
  }))

  // present the view controller
  self.present(alertControl, animated: true, completion: nil)
}