Question

我正在使用AVCaptureMetadataOutput来使用iOS QRCode，条形码扫描功能。这很好用，我得到了扫描AVCaptureMetadataOutput委托方法

的结果

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

但我不知道如何捕获扫描的qrcode图像，条形码和我在此代表中的数据。

Answer 1

我有captured image而scanning QRCode喜欢这样：

1）首先添加AVCaptureStillImageOutput's

的属性

@property (strong, nonatomic) AVCaptureStillImageOutput *stillImageOutput;

2）在初始化后在AVCaptureSession添加会话预设

[self.session setSessionPreset:AVCaptureSessionPreset640x480];

3）现在在AVCaptureStillImageOutput's

中添加AVCaptureSession作为输出

// Prepare an output for snapshotting
self.stillImageOutput = [AVCaptureStillImageOutput new];
[self.session addOutput:self.stillImageOutput];
self.stillImageOutput.outputSettings = @{AVVideoCodecKey: AVVideoCodecJPEG};

4）在代理方法captureOutput:didOutputMetadataObjects:fromConnection:connection中添加以下代码以捕获扫描图像

 __block UIImage *scannedImg = nil;
// Take an image of the face and pass to CoreImage for detection
AVCaptureConnection *stillConnection = [self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo];
[self.stillImageOutput captureStillImageAsynchronouslyFromConnection:stillConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
    if(error) {
        NSLog(@"There was a problem");
        return;
    }

    NSData *jpegData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];

    scannedImg = [UIImage imageWithData:jpegData];
    NSLog(@"scannedImg : %@",scannedImg);
}];

参考使用CodeScanViewController

多数民众赞成@Enjoy

AVFoundation，AVCaptureMetadataOutput捕获截图

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