识别照片中的二维码

经常有功能需求 从相册中发送一个二维码 然后直接识别当前二维码

代码如下

    //判断是否是二维码
    UIImage *srcImage =imageView.image;
    CIContext *context = [CIContext contextWithOptions:nil];
    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:context options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];
    CIImage *image = [CIImage imageWithCGImage:srcImage.CGImage];
    NSArray *features = [detector featuresInImage:image];
    CIQRCodeFeature *feature = [features firstObject];

    NSString *result = feature.messageString;
    if (result == 0) {
    //没有扫描到二维码
    }
    else{
    //存在二维码
    }