Some businesses are printing QR codes that have color gradients. My App using the native QR scan library but I can only seem to scan black and white QR codes. When scanning a QR code with Apple's camera app, it has no problem scanning the QR code that has a color gradient. But my app cannot scan the same QR code. Please advise on what line of code I need to add in order to recognize color gradient QR codes.
I forgot to mention the current code
{ AVCaptureSession* captureSession = [[AVCaptureSession alloc] init]; self.session = captureSession; AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; self.device = captureDevice; NSError *error = nil; self.input = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error]; if (self.input) [_session addInput:_input]; else NSLog(@"Error: %@", error); AVCaptureMetadataOutput *captureMetadataOutput = [[AVCaptureMetadataOutput alloc] init]; [captureSession addOutput:captureMetadataOutput]; self.output = captureMetadataOutput; dispatch_queue_t dispatchQueue; dispatchQueue = dispatch_queue_create("myQueue", NULL); [captureMetadataOutput setMetadataObjectsDelegate:self queue:dispatchQueue]; [captureMetadataOutput setMetadataObjectTypes:@[AVMetadataObjectTypeUPCECode, AVMetadataObjectTypeCode39Code, AVMetadataObjectTypeCode39Mod43Code, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode93Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypePDF417Code, AVMetadataObjectTypeQRCode, AVMetadataObjectTypeAztecCode]]; // [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; // [captureSession addOutput:_output]; self.output.metadataObjectTypes = [self.output availableMetadataObjectTypes]; self.prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.session]; self.prevLayer.frame = self.view.bounds; self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer:self.prevLayer]; [self.session startRunning]; [self.view bringSubviewToFront:self.highlightView]; }
fromConnection:(AVCaptureConnection *)connection { connection.enabled = NO; CGRect highlightViewRect = CGRectZero; AVMetadataMachineReadableCodeObject *barCodeObject; NSString *detectionString = nil; NSArray *barCodeTypes = @[AVMetadataObjectTypeUPCECode, AVMetadataObjectTypeCode39Code, AVMetadataObjectTypeCode39Mod43Code, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode93Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypePDF417Code, AVMetadataObjectTypeQRCode, AVMetadataObjectTypeAztecCode]; for (AVMetadataObject *metadata in metadataObjects) { NSLog(@"metadata type %@", [metadata type]); if ([metadata respondsToSelector:@selector(stringValue)]) NSLog(@"metadata string %@", [(AVMetadataMachineReadableCodeObject *)metadata stringValue]); for (NSString *type in barCodeTypes) { if ([metadata.type isEqualToString:type]) { barCodeObject = (AVMetadataMachineReadableCodeObject *)[_prevLayer transformedMetadataObjectForMetadataObject:(AVMetadataMachineReadableCodeObject *)metadata]; highlightViewRect = barCodeObject.bounds; detectionString = [(AVMetadataMachineReadableCodeObject *)metadata stringValue]; break; } } if (detectionString != nil) { [self.nativeScannerDelegate didFoundCode:metadata.type result:detectionString]; break; } } [self performSelector:@selector(closeWithoutAnimation) withObject:nil afterDelay:0.1]; self.highlightView.frame = highlightViewRect; }
You should better use the Code Block feature properly.
Even someone eager to help found this thread, they would not try to go further given this sort of unformatted code.