二维码

+(UIImage *)QRCodeWithString:(NSString *)string andSize:(CGFloat)size{
    //创建过滤器
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    //过滤器恢复默认
    [filter setDefaults];
    //将NSString格式转化成NSData格式
    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
    [filter setValue:data forKeyPath:@"inputMessage"];
    //获取二维码过滤器生成的二维码
    CIImage *image = [filter outputImage];
    
    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];
}

条形码

+ (UIImage *)barCodeWithInputMessage:(NSString *)inputMessage
                                       Width:(CGFloat)width
                                      Height:(CGFloat)height{
    NSData *inputData = [inputMessage dataUsingEncoding:NSISOLatin1StringEncoding allowLossyConversion:false];
    CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];
    [filter setValue:inputData forKey:@"inputMessage"]; // 设置条形码内容
    //    [filter setValue:@(50) forKey:@"inputQuietSpace"]; // 设置条形码上下左右margin值
    //    [filter setValue:@(height) forKey:@"inputBarcodeHeight"]; // 设置条形码高度
    CIImage *ciImage = filter.outputImage;
    CGFloat scaleX = width/ciImage.extent.size.width;
    CGFloat scaleY = height/ciImage.extent.size.height;
    ciImage = [ciImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)];
    UIImage *returnImage = [UIImage imageWithCIImage:ciImage];
    return returnImage;
}