原生扫描用到的几个类

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、、、

@property (strong,nonatomic)AVCaptureDevice * device;

@property (strong,nonatomic)AVCaptureDeviceInput * input;

@property (strong,nonatomic)AVCaptureMetadataOutput * output;

@property (strong,nonatomic)AVCaptureSession * session;

@property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview;

、、、

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按钮以及按钮事件

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btn=[[UIButton alloc]initWithFrame:CGRectMake(160, 120, 100, 50)];

    btn.backgroundColor=[UIColor grayColor];    [btn setTitle:@"开始扫描" forState:UIControlStateNormal];

    [btn addTarget:self action:@selector(clickbtn) forControlEvents:UIControlEventTouchUpInside];

    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    [self.view addSubview:btn];

    btn1=[[UIButton alloc]initWithFrame:CGRectMake(160, 210, 100, 50)];

    btn1.backgroundColor=[UIColor grayColor];

    [btn1 setTitle:@"扫描" forState:UIControlStateNormal];

    [btn1 addTarget:self action:@selector(clickbtn1) forControlEvents:UIControlEventTouchUpInside];

    [btn1 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    [self.view addSubview:btn1];

}

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-(void)clickbtn{

    BOOL isScan =[self checkAVAuthorizationStatus];

    if(isScan==YES) {

        NSLog(@"可以扫描");

    }else    {

        NSLog(@"怒可以");

        [btn1setEnabled:NO];

    }}

-(void)clickbtn1{ 

[selfsetScan];

}

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创建他们

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-(void)setScan

{

    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    // Input

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

    // Output

    _output = [[AVCaptureMetadataOutput alloc]init];

    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

    // Session

    _session = [[AVCaptureSession alloc]init];

    [_session setSessionPreset:AVCaptureSessionPresetHigh];

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连接输入和输出

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if ([_session canAddInput:self.input])

    {

        [_sessionaddInput:self.input];

    }

    if ([_session canAddOutput:self.output])

    {

        [_session addOutput:self.output];

    }

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设置条码类型

    _output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];

---

添加扫描画面

    _preview =[AVCaptureVideoPreviewLayer layerWithSession:_session];

    _preview.videoGravity =AVLayerVideoGravityResizeAspectFill;

    _preview.frame =self.view.layer.bounds;

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

---

开始扫描

    [_session startRunning];

}

最后实现协议AVCaptureMetadataOutputObjectsDelegat

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

{

    NSString*stringValue;

    if([metadataObjectscount] >0){

        //停止扫描        [_sessionstopRunning];

        AVMetadataMachineReadableCodeObject* metadataObject = [metadataObjectsobjectAtIndex:0];

        stringValue = metadataObject.stringValue;

    }

}

- (BOOL)checkAVAuthorizationStatus

{

    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

//    NSString *tips = NSLocalizedString(@"AVAuthorization", @"您没有权限访问相机");

    if(status == AVAuthorizationStatusAuthorized) {

        // authorized

//        [self setupCamera];

        returnYES;

    }else{

//        [SVProgressHUD showWithStatus:tips];

        returnNO;

    }

}