let alert = UIAlertController(title: "Warning", message: NSLocalizedString("not valid qr code", comment: ""), preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: NSLocalizedString("confirm", comment: ""), style: .default){
(action) in
//button alick event
})
present(alert, animated: true, completion: nil)
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