如何为iOS创建QR码阅读器

Question

我正在为我们的本地业务开发一个应用程序.我已经有了现场摄像头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,它正在读取QR码并将内容保存在一个字符串中.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

Answer 1

试试ZBar:http://zbar.sourceforge.net/iphone/sdkdoc/install.html

我们在支持iOS 4到iOS 6.1的应用程序中成功使用它

在我的情况下,我使用ZBarReaderView- 查看相机预览,自动检测并返回扫描的代码.

你需要:

#import "ZBarSDK.h"  


ZBarReaderView *readerView;

添加这个: <ZBarReaderViewDelegate>

然后:

[readerView.scanner setSymbology:ZBAR_QRCODE config:ZBAR_CFG_ENABLE to:0]; 
readerView.readerDelegate = self;

[readerView start];

- (void)readerView:(ZBarReaderView *)view didReadSymbols: (ZBarSymbolSet *)syms fromImage:(UIImage *)img
{
    for(ZBarSymbol *sym in syms) 
    {  
        NSLog(@"Did read symbols: %@", sym.data);

    }
}

无论如何,只需按照以下说明操作:

http://zbar.sourceforge.net/iphone/sdkdoc/tutorial.html

然后尝试一下 - 看看它是否适合你.

编辑

在这里,我上传了我从这里获取的示例项目:https://github.com/arciem/ZBarSDK

它启用了前置摄像头.经过测试 - 使用前置摄像头成功读取qr代码:

http://www.speedyshare.com/fkvqt/download/readertest.zip

要么

应用程序启动后 - 显示前置摄像头 - 扫描仪大小为200x200,并作为子视图. http://www.speedyshare.com/QZZU5/download/ReaderSample-v3.zip