alertview Controller (Swift 4 )

  

                let alertController = UIAlertController(title: "Name not provided", message: "Provide a name to the story", preferredStyle: .alert)

                let action = UIAlertAction(title: "ok", style: .default, handler: nil)

                alertController.addAction(action)

                present(alertController, animated: true, completion: nil)

                

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