UIViewController+UIAlertController.swift

extension UIViewController {
   func showAlert(withTitle title: String, message: String, actionTitle: String = "OK") {
      let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
      let action = UIAlertAction(title: actionTitle, style: .default, handler: nil)
      alertController.addAction(action)
      present(alertController, animated: true, completion: nil)
}
  func showHeyAlert() {
     // Customizable actionTitle
     showAlert(withTitle: "Hey", message: "HeyHey", actionTitle: "Hey Hey Yo")
  }
 func showHiAlertWithOK() {
     // actionTitle is "OK" (which is default)
     showAlert(withTitle: "Hi", message: "HiHi")
 }
}