识别二维码图片

今天做项目的时候需要添加一个根据识别二维码图片，以下就是实现的步骤以及相关代码：

1.在选择相册图片响应的代理事件（- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info）获取图片，并将其转换成NSData。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];
    if ([type isEqualToString:@"public.image"]) {
        UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
        NSData *imageData = UIImagePNGRepresentation(image);
        //imgView.image = image;
        [picker dismissViewControllerAnimated:YES completion:nil];
        [self readQRCodeFromImageWithFileURL:imageData];
    }
}

2.iOS8以后可以直接使用 CIQRCodeFeature进行解析，代码如下：

- (void)readQRCodeFromImageWithFileURL:(NSData *) data {
    CIImage *image = [CIImage imageWithData:data];
    //CIImage *image = [CIImage imageWithContentsOfURL:url];// 也可以根据URL找到CIImage
    if (image){
        //创建CIDetector
        CIDetector *qrDetector = [CIDetector detectorOfType:CIDetectorTypeQRCode
                                                    context:[CIContext contextWithOptions:@{kCIContextUseSoftwareRenderer : @(YES)}]
                                                    options:@{CIDetectorAccuracy : CIDetectorAccuracyHigh}];
        NSArray *features = [qrDetector featuresInImage:image];
        if ([features count] > 0){
            for (CIFeature *feature in features){
                if (![feature isKindOfClass:[CIQRCodeFeature class]]){
                    continue;
                }
                CIQRCodeFeature *qrFeature = (CIQRCodeFeature *)feature;
                NSString *content = qrFeature.messageString;//解析的数据
                NSLog(@"content is ：%@",content);
            }
        }
    }
    [self.extensionContext completeRequestReturningItems:nil
                                       completionHandler:^(BOOL expired) {
                                           NSLog(@"解析失败");
                                       }];
}

以上就是ios解析二维码图片的方法，以及相关代码，希望对大家有所帮助。