系统扫二维码

#import "WQRcodeVC.h"

#import <AVFoundation/AVFoundation.h>

@interface WQRcodeVC ()<AVCaptureMetadataOutputObjectsDelegate,UIAlertViewDelegate>

//设备

@property (nonatomic,strong)AVCaptureDevice *device;

//设备输入

@property (nonatomic,strong)AVCaptureDeviceInput *input;

@property (nonatomic,strong)AVCaptureMetadataOutput *output;

//扫描会话

@property (nonatomic,strong)AVCaptureSession *session;

//背景图片

@property (nonatomic,strong)UIImageView *bgImageView;

//扫描线

@property (nonatomic,strong)UIImageView *lineImageView;

//扫描图层

@property (nonatomic,strong) AVCaptureVideoPreviewLayer *layer;

@end

@implementation WQRcodeVC

-(UIImageView *)bgImageView{

    

    if (!_bgImageView) {

        _bgImageView = [[UIImageViewalloc] initWithFrame:CGRectMake(([UIScreenmainScreen].bounds.size.width - 280 ) /2.0,100, 280,280)];

        _bgImageView.image = [UIImageimageNamed:@"pick_bg"];

    }

    

    return_bgImageView;

    

}

-(UIImageView *)lineImageView{

    

    if (!_lineImageView) {

        _lineImageView = [[UIImageViewalloc] initWithFrame:CGRectMake(([UIScreenmainScreen].bounds.size.width - 280 ) /2.0,110, 280,2)];

        _lineImageView.image = [UIImageimageNamed:@"line"];

    }

    return_lineImageView;

}

- (void)viewDidLoad {

    [superviewDidLoad];

    // IOS7之前，都是使用第三方库zbar来实现扫面二维码的功能，IOS7之后系统提供了二维码扫描的方法（真机有效）

    self.view.backgroundColor = [UIColorlightGrayColor];

    

    [selfsetTitle:@"扫码"];

    

    [self.viewaddSubview:self.bgImageView];

    [self.viewaddSubview:self.lineImageView];

    

    //开始扫描二维码（条形码）

    [selfreadQrcode];

}

-(void)readQrcode{

    

    //实例化设备对象

    self.device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];

    

    NSError *error;

    //实例化设备输入

    self.input = [[AVCaptureDeviceInputalloc] initWithDevice:self.deviceerror:&error];

    

    if (error) {

        NSLog(@"error = %@",error);

    }

    

    

    //实例化设备输出

    self.output = [AVCaptureMetadataOutputnew];

    //设置代理

    [self.outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];

    

    //实例化扫描会话

    self.session = [AVCaptureSessionnew];

    

    //添加会话输入

    [self.sessionaddInput:self.input];

    //添加会话输出

    [self.sessionaddOutput:self.output];

    

    //设置输出支持的二维码或者条形码类型（一定要添加到会话之后再设置类型，否则会崩溃）

    [self.outputsetMetadataObjectTypes:@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeCode39Mod43Code,AVMetadataObjectTypeCode93Code,AVMetadataObjectTypeCode128Code]];

    

    //添加扫描图层

    AVCaptureVideoPreviewLayer *PreviewLayer = [[AVCaptureVideoPreviewLayeralloc] initWithSession:self.session];

    

    //设置图层布局(铺满)

    PreviewLayer.videoGravity =AVLayerVideoGravityResizeAspectFill;

    

    //设置图层大小和位置

    PreviewLayer.frame =CGRectMake(([UIScreenmainScreen].bounds.size.width - 280 ) /2.0,110, 280,280);

    

    //把扫描的图层出入到self.View的最底层layer当中

    [self.view.layerinsertSublayer:PreviewLayeratIndex:0];

    

    self.layer = PreviewLayer;

    

    //开始扫描

    [self.sessionstartRunning];

   

    

    //循环移动扫描线

    [selflineMoveAround];

    

}

详细完整资源资源代码：http://download.csdn.net/detail/qq_33646395/9766846