ios7以上二维码的使用

1.核心代码

启动摄像头

 - (void)setupCamera
 {
     // Device
     AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

     // Input
     AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];

     // Output
     AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc]init];
     [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

     // Session
     session = [[AVCaptureSession alloc]init];
     [session setSessionPreset:AVCaptureSessionPresetHigh];
     if ([session canAddInput:input])
     {
         [session addInput:input];
     }

     if ([session canAddOutput:output])
     {
         [session addOutput:output];
     }

     // 条码类型 AVMetadataObjectTypeQRCode
     if ([output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeQRCode]) {
         output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];//[NSArray arrayWithObject:AVMetadataObjectTypeQRCode];
     }

     // Preview
     AVCaptureVideoPreviewLayer *preview =[AVCaptureVideoPreviewLayer layerWithSession:session];
     preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
     CGRect imageViewFrame = imageView.frame;
     preview.frame = CGRectMake(imageViewFrame.origin.x + 10, imageViewFrame.origin.y + 10, imageViewW - 20, imageViewW - 20);
     [self.view.layer insertSublayer:preview atIndex:0];

     // Start
     [session startRunning];
 }

扫描完成后的回调处理

 - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
 {
     if (scanIsOK) return;
     scanIsOK = YES;

     NSString *stringValue;

     if ([metadataObjects count] > 0)
     {
         AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects objectAtIndex:0];
         stringValue = metadataObject.stringValue;
     }

     [session stopRunning];
     [timer invalidate];
     timer = nil;
     if ([UIUtils checkURL:stringValue]) {

     }else{

     }

 }

demo下载地址 ios7自带的二维码扫描