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SuperScanner

QRScanner BarCodeScanner 二维码条形码扫描
iOS二维码条形码扫描,支持iOS7+,限制扫描区域,提高扫描速度

iOS使用系统API进行二维码条形码扫描&限制扫描区域


GitHub看了不少,找了些,发现没几个满意的,于是自己整理了一下。 重新写了个demo

1.创建扫描

关键代码如下:

    //创建会话
    self.session = [[AVCaptureSession alloc] init];
    
    //获取摄像头设备
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    NSError *error = nil;

    //创建输入流
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];

    if(input) {
        [self.session addInput:input];
    } else {
        //出错处理
        NSLog(@"%@", error);
        NSString *msg = [NSString stringWithFormat:@"请在手机【设置】-【隐私】-【相机】选项中,允许【%@】访问您的相机",[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleDisplayName"]];

        UIAlertView *av = [[UIAlertView alloc]initWithTitle:@"提醒"
                                                    message:msg
                                                   delegate:self
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles: nil];
        [av show];
        return;
    }
    
    //创建输出流
    AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
    [self.session addOutput:output];
    
    //设置扫码类型
    output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode,  //条形码
                                   AVMetadataObjectTypeEAN13Code,
                                   AVMetadataObjectTypeEAN8Code,
                                   AVMetadataObjectTypeCode128Code];
    //设置代理,在主线程刷新
    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
    //创建摄像头取景区域
    self.previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
    self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    [self.view.layer insertSublayer:self.previewLayer atIndex:0];
    
    if ([self.previewLayer connection].isVideoOrientationSupported)
        [self.previewLayer connection].videoOrientation = AVCaptureVideoOrientationPortrait;
        
    //开始扫码
    [self.session startRunning];

2. 限制扫描区域

demo截图
如图所示,非指定区域内不会识别,这样能够这样能够加快识别速度。

AVCaptureMetadataOutput *output;
output.rectOfInterest

关键是设置这个属性,但是很多坑,参考不少资料试了很多方法,原来是要在AVCaptureInputPortFormatDescriptionDidChangeNotification通知内设置才行。

__weak typeof(self) weakSelf = self;
[[NSNotificationCenter defaultCenter]addObserverForName:AVCaptureInputPortFormatDescriptionDidChangeNotification
                                                 object:nil
                                                  queue:[NSOperationQueue mainQueue]
                                             usingBlock:^(NSNotification * _Nonnull note) {
                                                 if (weakSelf){
                                                     //调整扫描区域
                                                     AVCaptureMetadataOutput *output = weakSelf.session.outputs.firstObject;
                                                     output.rectOfInterest = [weakSelf.previewLayer metadataOutputRectOfInterestForRect:weakSelf.scanerView.scanAreaRect];
                                                 }
                                             }];

参考(感谢)博文资料:
IOS7使用原生API进行二维码和条形码的扫描
iOS 原生二维码扫描(可限制扫描区域)
IOS二维码扫描,你需要注意的两件事
iOS 原生扫 QR 码的那些事

博文地址