在视频直播源码开发过程中，有时会需要用到二维码扫描功能，用户只要点开系统自带的摄像头，就能够扫描二维码，那么，这一功能该如何去实现呢？

一、 视频直播源码实现摄像头扫描

if (!_scanView) {
        _scanView = [[SGQRCodeScanView alloc] initWithFrame:CGRectMake(0, 64+statusbarHeight, _window_width, _window_height-64-statusbarHeight)];
        _scanView.scanImageName = @"SGQRCode.bundle/QRCodeScanLineGrid";
        _scanView.scanAnimationStyle = ScanAnimationStyleGrid;
        _scanView.cornerLocation = CornerLoactionOutside;
        _scanView.cornerColor = [UIColor orangeColor];
    }
YBWeakSelf;
    SGQRCodeObtainConfigure *configure = [SGQRCodeObtainConfigure QRCodeObtainConfigure];
    configure.sampleBufferDelegate = YES;
    [obtain establishQRCodeObtainScanWithController:self configure:configure];
    [obtain setBlockWithQRCodeObtainScanResult:^(SGQRCodeObtain *obtain, NSString *result) {
        if (result) {
            [obtain stopRunning];
            [obtain playSoundName:@"SGQRCode.bundle/sound.caf"];
            
            NSLog(@"===%@",result);
            
            NSArray *resA = [result componentsSeparatedByString:@"&"];
            NSArray *roomA = [NSArray array];
            NSArray *channelA = [NSArray array];
            
            NSLog(@"resA:%@",resA);
            for (NSString *needStr in resA) {
                if ([needStr containsString:@"roomid"]) {
                    roomA = [needStr componentsSeparatedByString:@"="];
                    NSLog(@"roomA:%@",roomA);
                }else if([needStr containsString:@"channel"]){
                    channelA = [needStr componentsSeparatedByString:@"="];
                    NSLog(@"roomA:%@",channelA);
                }
            }
            
            if (roomA.count<2 ||channelA.count<2) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    [MBProgressHUD showErrorInfo:@[YZMsg(@"信息错误"),@"QRScan"]];
                });
                return ;
            }
            [weakSelf qrReset:@{@"id":roomA[1],@"channel":channelA[1]}];
            
        }
    }];
    [obtain setBlockWithQRCodeObtainScanBrightness:^(SGQRCodeObtain *obtain, CGFloat brightness) {
        if (brightness < - 1) {
            [weakSelf.view addSubview:weakSelf.flashlightBtn];
        } else {
            if (weakSelf.isSelectedFlashlightBtn == NO) {
                [weakSelf removeFlashlightBtn];
            }
        }
}];

二、在相册中进行选择

从相册中选择二维码后，视频直播源码应当有自助判断能力，确认该图片中是否具备二维码，超时未识别出二维码时，应当做出反馈

YBWeakSelf;
    [obtain establishAuthorizationQRCodeObtainAlbumWithController:nil];
    if (obtain.isPHAuthorization == YES) {
        [self.scanView removeTimer];
    }
    [obtain setBlockWithQRCodeObtainAlbumDidCancelImagePickerController:^(SGQRCodeObtain *obtain) {
        [weakSelf.view addSubview:weakSelf.scanView];
    }];
    [obtain setBlockWithQRCodeObtainAlbumResult:^(SGQRCodeObtain *obtain, NSString *result) {
        if (result == nil) {
            NSLog(@"暂未识别出二维码");
            [MBProgressHUD showPop:@"未能识别"];
        } else {
            NSLog(@"===res:%@",result);
            NSArray *resA = [result componentsSeparatedByString:@"&"];
            NSArray *roomA = [NSArray array];
            NSArray *channelA = [NSArray array];
            
            NSLog(@"resA:%@",resA);
            for (NSString *needStr in resA) {
                if ([needStr containsString:@"roomid"]) {
                    roomA = [needStr componentsSeparatedByString:@"="];
                    NSLog(@"roomA:%@",roomA);
                }else if([needStr containsString:@"channel"]){
                    channelA = [needStr componentsSeparatedByString:@"="];
                    NSLog(@"roomA:%@",channelA);
                }
            }
            
            if (roomA.count<2 ||channelA.count<2) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    [MBProgressHUD showErrorInfo:@[YZMsg(@"信息错误"),@"QRScan"]];
                });
                return ;
            }
            [weakSelf qrReset:@{@"id":roomA[1],@"channel":channelA[1]}];

        }
    }];

三、销毁移除二维码

在使用完后，该二维码无需被保留，视频直播源码中应当编辑一串代码保障用户信息不受侵犯，以下是销毁移除的代码：

[self.scanView removeTimer]; 
[self removeFlashlightBtn]; 
[obtain stopRunning];