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 #import "ViewController.h"

//记得添加AVFoundation框架

#import <AVFoundation/AVFoundation.h>

@interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>

@property(nonatomic,strong)AVCaptureDevice *captureDevice;

@property(nonatomic,strong)AVCaptureSession *captureSession;

@property(nonatomic,strong)AVCaptureVideoPreviewLayer *videoPreviewLayer;

@property(nonatomic,strong)AVCaptureMetadataOutput *output;

@property(nonatomic,strong)AVCaptureDeviceInput *input;

@end

@implementation ViewController

{

    UIView *_viewPreview;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //创建一个承载扫描的view

    _viewPreview=[[UIView alloc]initWithFrame:CGRectMake(200, 20, 100, 100)];

    [self.view addSubview:_viewPreview];

    NSError *error=nil;

    _captureDevice=[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    _input=[AVCaptureDeviceInput deviceInputWithDevice:_captureDevice error:&error];

    if (!_input) {

        NSLog(@"error=========%@",[error localizedDescription]);

    }else{

        _captureSession=[[AVCaptureSession alloc]init];

        //设置会话的输入设备

        [_captureSession addInput:_input];

        //对应输出

        _output=[[AVCaptureMetadataOutput alloc]init];

        [_captureSession addOutput:_output];

        //创建一个队列

        dispatch_queue_t dispatchQueue;

        dispatchQueue = dispatch_queue_create("myQueue", NULL);

        [_output setMetadataObjectsDelegate:self queue:dispatchQueue];

        [_output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];

        //将捕获的数据流展现出来

        _videoPreviewLayer=[[AVCaptureVideoPreviewLayer alloc]initWithSession:_captureSession];

        [_videoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];

        [_videoPreviewLayer setFrame:_viewPreview.layer.bounds];

        [_viewPreview.layer addSublayer:_videoPreviewLayer];     

        [_captureSession startRunning];

    }

}

-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection

{

    if (metadataObjects !=nil && [metadataObjects count]>0) {

        AVMetadataMachineReadableCodeObject *metadataObj=[metadataObjects objectAtIndex:0];

        if ([[metadataObj type]isEqualToString:AVMetadataObjectTypeQRCode]) {

            //获得扫描数据，并结束扫描

            [self performSelectorOnMainThread:@selector(stopReading:) withObject:metadataObj.stringValue waitUntilDone:NO];

        }

    } 

}

-(void)stopReading:(NSString *)str{

    [_captureSession stopRunning];

    NSLog(@"str=======%@",str);

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

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原文地址：http://www.cnblogs.com/huketianxia/p/4550891.html