MyAlertController.swift

class MyAlertController {

   func showAlert(on vc: UIViewController, withTitle title: String, message: String, actionTitle: String) {
      let alertController = UIAlertController(..)
      let action = UIAlertAction(...)
      alertController.addAction(action)
      vc.present(alertController, animated: true, completion: nil)
   }

   func showErrorMessage(on vc: UIViewController) {
       showAlert(on: vc, withTitle: "ERROR!", message: "Something went wrong", actionTitle: "OK")
   }

}