QR码扫描在iOS应用程序

我需要将QR码阅读器集成到应用程序中，并find了一个教程 。

我从这个链接下载了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]; } 

所有需要的框架都被添加了，所以没有referenced from错误。

当我点击扫描button，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图像不被扫描，即imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo函数不被调用。
2. QR图像显示比原始大小大。

如何解决这个问题？

为什么图像没有被扫描？

Answer 1

在我们的iPhone应用程序中使用ZBar SDK进行BR和QR码扫描。

你可以find一步一步的文章，以及如何处理示例代码

如何在iPhone教程中使用条形码扫描器（BR和QR）（使用ZBar）

看看它怎么运作

1. 从这里下载ZBar SDK

2. 在你的项目中添加下面的框架

   • AVFoundation.framework
   • CoreGraphics.framework
   • CoreMedia.framework
   • CoreAudio.framework
   • CoreVideo.framework
   • QuartzCore.framework
   • libiconv.dylib

3. 在框架中添加下载的zip库libzbar.a

4. 在你的class级中导入标题并确认它是委托

   #import“ZBarSDK.h”

和

 @interface ViewController : UIViewController <ZBarReaderDelegate> 

5.扫描图像

 - (IBAction)startScanning:(id)sender { NSLog(@"Scanning.."); resultTextView.text = @"Scanning.."; ZBarReaderViewController *codeReader = [ZBarReaderViewController new]; codeReader.readerDelegate=self; codeReader.supportedOrientationsMask = ZBarOrientationMaskAll; ZBarImageScanner *scanner = codeReader.scanner; [scanner setSymbology: ZBAR_I25 config: ZBAR_CFG_ENABLE to: 0]; [self presentViewController:codeReader animated:YES completion:nil]; } 

6.获得结果

 - (void) imagePickerController: (UIImagePickerController*) reader didFinishPickingMediaWithInfo: (NSDictionary*) info { // get the decode results id<NSFastEnumeration> results = [info objectForKey: ZBarReaderControllerResults]; ZBarSymbol *symbol = nil; for(symbol in results) // just grab the first barcode break; // showing the result on textview resultTextView.text = symbol.data; resultImageView.image = [info objectForKey: UIImagePickerControllerOriginalImage]; // dismiss the controller [reader dismissViewControllerAnimated:YES completion:nil]; } 

希望这会帮助你，如果你在这个例子中发现任何麻烦，也请让我知道，乐意帮忙

官方文件

Answer 2

与iOS7的发布一样，您不再需要使用外部框架或库。 具有AVFoundation的iOS生态系统现在完全支持从EAN到UPC的几乎所有的QR码扫描 。

只要看看技术说明和AVFoundation编程指南 。 AVMetadataObjectTypeQRCode是你的朋友。

这是一个很好的教程 ，它一步一步显示： iPhone QR码扫描库iOS7

只是一个例子，如何设置它：

 #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]; } 

Answer 3

尝试在iOS 7和更新。

要抓取QR码：

 - (IBAction)Capture:(id)sender { isFirst=true; _session = [[AVCaptureSession alloc] init]; _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; NSError *error = nil; _input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:&error]; if (_input) { [_session addInput:_input]; } else { NSLog(@"Error: %@", error); } _output = [[AVCaptureMetadataOutput alloc] init]; [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; [_session addOutput:_output]; _output.metadataObjectTypes = [_output availableMetadataObjectTypes]; _prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session]; _prevLayer.frame = self.view.bounds; _prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer:_prevLayer]; [_session startRunning]; } 

要阅读，使用它的委托方法：

 - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection { 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) { 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) { if (isFirst) { isFirst=false; _label.text = detectionString; break; } } else _label.text = @"(none)"; } _highlightView.frame = highlightViewRect; } 

Answer 4

首先从这里 导入ZXingWidget库 。

尝试这个 ，

 - (IBAction)btnScanClicked:(id)sender { ZXingWidgetController *widController = [[ZXingWidgetController alloc] initWithDelegate:self showCancel:YES OneDMode:NO]; QRCodeReader* qrcodeReader = [[QRCodeReader alloc] init]; NSSet *readers = [[NSSet alloc ] initWithObjects:qrcodeReader,nil]; [qrcodeReader release]; widController.readers = readers; [readers release]; NSBundle *mainBundle = [NSBundle mainBundle]; widController.soundToPlay = [NSURL fileURLWithPath:[mainBundle pathForResource:@"beep-beep" ofType:@"aiff"] isDirectory:NO]; [self presentModalViewController:widController animated:YES]; [widController release]; } 

和代表

 - (void)zxingController:(ZXingWidgetController*)controller didScanResult:(NSString *)result { } 

Answer 5

您可以使用我自己的QRCodeReader框架。

https://www.cocoacontrols.com/controls/qrcodereader

如何使用

1. embedded式二进制文件
2. 在您的视图控制器中拖放UIView。
3. 改变UIVIEW的类别。
4. 绑定你的UIView。

在视图控制器中粘贴“M1，M2”方法（即“ViewController.m”）

“M1”viewDidLoad

 - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. self.title = @"QR Code Reader"; [qrCodeView setDelegate:self]; [qrCodeView startReading]; } 

在这里委托方法： “M2”QRCodeReaderDelegate

 #pragma mark - QRCodeReaderDelegate - (void)getQRCodeData:(id)qRCodeData { UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"QR Code" message:qRCodeData preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"Close" style:UIAlertActionStyleDefault handler:nil]; [alertController addAction:cancel]; UIAlertAction *reScan = [UIAlertAction actionWithTitle:@"Rescan" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { [qrCodeView startReading]; }]; [alertController addAction:reScan]; [self presentViewController:alertController animated:YES completion:nil]; } 

谢谢。