Resize Image With low memory

UIImage+VI_Resize.m

+ (UIImage *)resizeImage:(UIImage *)image scaledToFitSize:(CGFloat)max
{
    NSData *imageData = [NSData dataWithData:UIImageJPEGRepresentation(image, 1.0)];
    CGImageSourceRef imageSource = CGImageSourceCreateWithData((__bridge CFDataRef)imageData, NULL);
    if (!imageSource)
        return nil;
    
    CFDictionaryRef options = (__bridge CFDictionaryRef)[NSDictionary dictionaryWithObjectsAndKeys:
                                                (id)kCFBooleanTrue, (id)kCGImageSourceCreateThumbnailWithTransform,
                                                (id)kCFBooleanTrue, (id)kCGImageSourceCreateThumbnailFromImageIfAbsent,
                                                (id)[NSNumber numberWithFloat:max], (id)kCGImageSourceThumbnailMaxPixelSize,
                                                nil];
    CGImageRef imgRef = CGImageSourceCreateThumbnailAtIndex(imageSource, 0, options);
    
    UIImage* scaled = [UIImage imageWithCGImage:imgRef];
    
    CGImageRelease(imgRef);
    CFRelease(imageSource);
    
    return scaled;
}