anchor.diff:          notifyListeners();
         }
       });
  +    notifyListeners();
     }
   
     Future<Map<String, dynamic>> createUserData() async {
  
positive.code:   ///SERVICES
    BarcodeService _barcodeService;
  
    void onQRViewCreated(QRViewController controller) {
      this._controller = controller;
      controller.scannedDataStream.listen((scanData) {
        if (_qrText != scanData) {
  
negative.code: 
      ///INITIALIZE SERVICES
      _barcodeService = BarcodeService();
      initState();
    }
  
    ///STATES
  