iphone - ios应用程序中的QR码扫描

Question

我需要在应用程序中集成 QR 码阅读器并找到一个 tutorial

我从这个link下载了Z-bar sdk .

这是我所做的。

在QRscannerViewController.m中

-(IBAction)StartScan:(id) sender
{
    ZBarReaderViewController *reader = [ZBarReaderViewController new];
     reader.readerDelegate = self;

     reader.readerView.torchMode = 0;

    ZBarImageScanner *scanner = reader.scanner;
    // TODO: (optional) additional reader configuration here

    // EXAMPLE: disable rarely used I2/5 to improve performance
    [scanner setSymbology: ZBAR_I25
     config: ZBAR_CFG_ENABLE
      to: 0];

     // present and release the controller
     [self presentModalViewController: reader
       animated: YES];
     [reader release];

    resultTextView.hidden=NO;
 }

 - (void) readerControllerDidFailToRead: (ZBarReaderController*) reader
                         withRetry: (BOOL) retry{
     NSLog(@"the image picker failing to read");

 }

 - (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info
 {


     NSLog(@"the image picker is calling successfully %@",info);
      // ADD: get the decode results
     id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults];
     ZBarSymbol *symbol = nil;
     NSString *hiddenData;
      for(symbol in results)
       hiddenData=[NSString stringWithString:symbol.data];
      NSLog(@"the symbols  is the following %@",symbol.data);
      // EXAMPLE: just grab the first barcode
     //  break;

      // EXAMPLE: do something useful with the barcode data
      //resultText.text = symbol.data;
      resultTextView.text=symbol.data;


       NSLog(@"BARCODE= %@",symbol.data);

      NSUserDefaults *storeData=[NSUserDefaults standardUserDefaults];
      [storeData setObject:hiddenData forKey:@"CONSUMERID"];
      NSLog(@"SYMBOL : %@",hiddenData);
      resultTextView.text=hiddenData;
     [reader dismissModalViewControllerAnimated: NO];

 }

添加了所有需要的框架，因此没有referenced from错误。

当我点击扫描按钮时，ZBarReaderViewController 显示正常，我按住 alt 键并左键单击鼠标打开模拟器的照片库，一切正常。

问题是什么，

1. QR 图像未被扫描，即 imagePickerController:
(UIImagePickerController*) 读者 didFinishPickingMediaWithInfo函数未被调用。
2. QR 图片看起来比原始尺寸大。

如何解决？

为什么扫描不到图像？

Answer 1

随着 iOS7 的发布，您不再需要使用外部框架或库。 带有 AVFoundation 的 iOS 生态系统现在完全支持扫描从 QR over EAN 到 UPC 的几乎所有代码。

看看Tech Note和 AVFoundation programming guide . AVMetadataObjectTypeQRCode是你的 friend 。

这是一个很好的教程，它一步一步地展示了它: iPhone QR code scan library iOS7

只是一个关于如何设置它的小例子:

#pragma mark -
#pragma mark AVFoundationScanSetup

- (void) setupScanner
{
    self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    self.input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];

    self.session = [[AVCaptureSession alloc] init];

    self.output = [[AVCaptureMetadataOutput alloc] init];
    [self.session addOutput:self.output];
    [self.session addInput:self.input];

    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    self.output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];

    self.preview = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
    self.preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
    self.preview.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

    AVCaptureConnection *con = self.preview.connection;

    con.videoOrientation = AVCaptureVideoOrientationLandscapeLeft;

    [self.view.layer insertSublayer:self.preview atIndex:0];

    [self.session startRunning];

}