public CaptureDelegate(QRScannerViewController parent)
 {
     this.parent = parent;
 }
 public CaptureDelegate(QRScannerViewController parent)
 {
     this.parent = parent;
 }
 public QrScanner(QRScannerViewController parent)
 {
     this.parent = parent;
     this.reader = new MultiFormatReader {
         Hints = new Hashtable {
             //BarcodeFormat.QR_CODE, PDF417
             { DecodeHintType.POSSIBLE_FORMATS, new ArrayList {  BarcodeFormat.QR_CODE } }
         }
     };
 }