Question

So i need to write a QR reader for an iphone application. Usually frameworks like ZXING and ZBAr allow you to download an application and then read the barcode. I want to integrate it within the application itself. So basically i want to be able to tap a button and have it reading the QR code. Is this possible? If so are there any proper documentation on this? I tried using ZXing but when i link binaries libZXingWidget.a is unavailable. Also the documentation is not enough to know how to integrate it within the application. So let me know.

Answer 1

Here’s code to setup ZBar, make sure to add the SDK to your project and link your library.

–

(void)viewDidLoad
{
        [ZBarReaderView class];
        readerView.readerDelegate = self;
        readerView.tracksSymbols = NO;

            //CHOOSE CAMERA
            if (some setting isEqual to CameraRear) {
                readerView.device = [self backFacingCameraIfAvailable];
            }
            else {
                readerView.device = [self frontFacingCameraIfAvailable];
            }

        [self relocateReaderPopover:[self interfaceOrientation]];
        [readerView start];
    }

-(AVCaptureDevice *)frontFacingCameraIfAvailable
{
    NSArray *videoDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    AVCaptureDevice *captureDevice = nil;
    for (AVCaptureDevice *device in videoDevices)
    {
        if (device.position == AVCaptureDevicePositionFront)
        {
            captureDevice = device;
            break;
        }
    }

    //  couldn't find one on the front, so just get the default video device.
    if ( ! captureDevice)
    {
        captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    }

    return captureDevice;
}

-(AVCaptureDevice *)backFacingCameraIfAvailable
{
    NSArray *videoDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    AVCaptureDevice *captureDevice = nil;
    for (AVCaptureDevice *device in videoDevices)
    {
        if (device.position == AVCaptureDevicePositionBack)
        {
            captureDevice = device;
            break;
        }
    }

    //  couldn't find one on the front, so just get the default video device.
    if ( ! captureDevice)
    {
        captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    }

    return captureDevice;
}

-(void)relocateReaderPopover:(UIInterfaceOrientation)toInterfaceOrientation{
    if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
        readerView.previewTransform = CGAffineTransformMakeRotation(M_PI_2);
    } else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
        readerView.previewTransform = CGAffineTransformMakeRotation(-M_PI_2);
    } else if (toInterfaceOrientation== UIInterfaceOrientationPortraitUpsideDown) {
        readerView.previewTransform = CGAffineTransformMakeRotation(M_PI);
    } else {
        readerView.previewTransform = CGAffineTransformIdentity;
    }
}