initializeController method
void
initializeController()
Implementation
void initializeController(){
// Function for detect barcode from image
widget.controller.attachDetectBarcodeFromFile(_detectBarcodeFromFile);
// Function for toggle flash mode
widget.controller.attachSetFlashMode(_cameraController!.setFlashMode);
//
widget.controller.attachPause(_pauseCamera);
//
widget.controller.attachResume(_resumeCamera);
}