- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
 [picker dismissViewControllerAnimated:YES completion:nil];
  
 UIImage *selectedImage = [info objectForKey:UIImagePickerControllerEditedImage];
 CIImage *ciImage = [[CIImage alloc] initWithImage:selectedImage];
  
 CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{CIDetectorAccuracy:CIDetectorAccuracyLow}];
 NSArray *features = [detector featuresInImage:ciImage];
  
 if (features.count > 0) {
  CIQRCodeFeature *feature = features.firstObject;
  NSString *message = feature.messageString;
   
  // display message
  [self displayMessage:message];
   
  // play sound
  if (self.audioPlayer) {
   [self.audioPlayer play];
  }
 }
}