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  • iOS:二维码的扫描

    iOS 中二维码的扫描借用#import <AVFoundation/AVFoundation.h> 实现,会用到<AVCaptureMetadataOutputObjectsDelegate>这个代理,并会调用相机进行扫描,

    具体实现步骤如下:

    //1.创建捕捉会话
    AVCaptureSession *session = [[AVCaptureSession alloc] init];
        
    //2.添加一个输入源
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
    [session addInput:input];
    self.session = session;
        
    //3.添加一个输出源
    AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    [session addOutput:output];
    [output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
        
    //4.添加一个预览图层
    AVCaptureVideoPreviewLayer *layer = [AVCaptureVideoPreviewLayer layerWithSession:session];
    layer.frame = self.view.bounds;
    [self.view.layer addSublayer:layer];
    self.layer = layer;
        
    // 5.开启扫描
    [session startRunning];
    
     
    #pragma mark - 实现输出源的代理方法
    - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
    {
        if (metadataObjects.count > 0) {
            AVMetadataMachineReadableCodeObject *object = [metadataObjects lastObject];
            NSLog(@"%@", object.stringValue);
            
            [self.session stopRunning];
            [self.layer removeFromSuperlayer];
        } else {
            NSLog(@"获取数据失败");
        }
    }

     

        

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  • 原文地址:https://www.cnblogs.com/XYQ-208910/p/5121854.html
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