问题 如何为iOS创建QR码阅读器

我正在为我们的本地业务开发一个应用程序。我已经有了相机 UIImageView，现在我需要知道如何从中读取QR码 UIImageView 并在标签中显示内容（0000-KKP0-2013）。

所以基本上我需要一个QR码扫描器，它读取QR码并将内容保存在字符串中。我已经使用过ZXing（“Zebra Crossing”），但它与iOS 6不兼容，它不起作用。是否有一个简单的代码来获取字符串中的QR码内容？

谢谢！

这是我在.m文件中使用的代码：

#import "ZBarSDK.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize vImagePreview;             

- (void)viewDidUnload
{
    [super viewDidUnload];

    vImagePreview = nil;
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];


    //----- SHOW LIVE CAMERA PREVIEW -----
    AVCaptureSession *session = [[AVCaptureSession alloc] init];
    session.sessionPreset = AVCaptureSessionPreset352x288;

    /*CALayer *viewLayer = self.vImagePreview.layer;
    NSLog(@"viewLayer = %@", viewLayer);*/

    AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];

    captureVideoPreviewLayer.frame = self.vImagePreview.bounds;
    [self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];

    AVCaptureDevice *device = [self frontCamera];

    NSError *error = nil;
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
    if (!input) {
        // Handle the error appropriately.
        NSLog(@"ERROR: trying to open camera: %@", error);

        UIAlertView *alert = [[UIAlertView alloc]
                              initWithTitle:@"QReader"
                              message:[NSString stringWithFormat:@"ERROR: Versuch die Kamera zu öffnen ist fehlgeschlagen [%@]",error]
                              delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];

        alert.tag = 1;

        [alert show];
    }
    [session addInput:input];

    [session startRunning];

    }

- (AVCaptureDevice *)frontCamera {
    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for (AVCaptureDevice *device in devices) {
        if ([device position] == AVCaptureDevicePositionFront) {
            return device;
        }
    }
    return nil;
}

现在我需要知道如何使用ZBarSDK从vImagePreview读取QR码。我不能使用UIPickerView