iOS 图片中二维码的识别

- (void)detectorImage:(UIImage *)image{
    
    // CIDetector(CIDetector可用于人脸识别)进行图片解析，从而使我们可以便捷的从相册中获取到二维码
    // 声明一个 CIDetector，并设定识别类型 CIDetectorTypeText
    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{CIDetectorAccuracy: CIDetectorAccuracyHigh}];
    
    // 取得识别结果
    NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];
    
    if (features.count == 0) {
        NSLog(@"暂未识别 - - %@", features);

        return;
        
    } else {
        for (int index = 0; index < [features count]; index ++) {
            
            CIQRCodeFeature *feature = [features objectAtIndex:index];
            NSLog(@"读取二维码数据信息 - - %@",            @(feature.bounds));
            NSLog(@"读取二维码数据信息2 - - %@",            feature.messageString);
        }
    }
}