ios二维码的生成与二维码图片的扫描

逃离我推掉我的手 2022-06-10 12:07 256阅读 0赞

/**
     *  根据地址生成二维码图片
     *
     *  @param code 地址字符串
     *  @param size 图片的大小
     *
     *  @return
     */
    -(UIImage *)getQRCode:(NSString *)code size:(CGFloat)size {
        CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
        [filter setDefaults];
        NSString *dataString = code;
        NSData *data = [dataString dataUsingEncoding:NSUTF8StringEncoding];
        [filter setValue:data forKeyPath:@"inputMessage"];
        CIImage *outputImage = [filter outputImage];
        return [self createNonInterpolatedUIImageFormCIImage:outputImage withSize:size];
    }
    
    /**
     *  根据CIImage生成指定大小的UIImage
     *
     *  @param image CIImage
     *  @param size  图片宽度
     */
    - (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size
    {
        CGRect extent = CGRectIntegral(image.extent);
        CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
        
        // 1.创建bitmap;
        size_t width = CGRectGetWidth(extent) * scale;
        size_t height = CGRectGetHeight(extent) * scale;
        CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
        CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
        CIContext *context = [CIContext contextWithOptions:nil];
        CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
        CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
        CGContextScaleCTM(bitmapRef, scale, scale);
        CGContextDrawImage(bitmapRef, extent, bitmapImage);
        
        // 2.保存bitmap到图片
        CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
        CGContextRelease(bitmapRef);
        CGImageRelease(bitmapImage);
        return [UIImage imageWithCGImage:scaledImage];
    }

/**
     *  根据二维码图片获取地址
     *
     *  @param image 二维码图片
     *
     *  @return
     */
    -(NSString *)readQRCodeFromImage:(UIImage *)image{
        NSData *data = UIImagePNGRepresentation(image);
        CIImage *ciimage = [CIImage imageWithData:data];
        if (ciimage) {
            CIDetector *qrDetector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:[CIContext contextWithOptions:@{kCIContextUseSoftwareRenderer:@(YES)}] options:@{CIDetectorAccuracy : CIDetectorAccuracyHigh}];
            NSArray *resultArr = [qrDetector featuresInImage:ciimage];
            if (resultArr.count >0) {
                CIFeature *feature = resultArr[0];
                CIQRCodeFeature *qrFeature = (CIQRCodeFeature *)feature;
                NSString *result = qrFeature.messageString;
                
                return result;
            }else{
                return nil;
            }
        }else{
            return nil;
        }
    }