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Create AlertController in swift 3

let alertVC: UIAlertController = UIAlertController (title: "Alert", message: "YOUR MESSAGE", preferredStyle: .alert)
  let okBtn = UIAlertAction.init(title: "Ok", style: .default, handler: { _ in
                          // Perform whatever you want
                        })
   alertVC.addAction(okBtn)
   self.present(alertVC, animated: true, completion: nil)
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