UIColor to UIImage

UIColor+STColor.m

#pragma mark - UIImage Representations

- (UIImage *)imageRepresentation
{
    CGFloat scale = [[UIScreen mainScreen] scale];

    CGRect rect = CGRectMake(0, 0, scale, scale);

    CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(NULL, CGRectGetWidth(rect), CGRectGetHeight(rect), 8, 0, rgbColorSpace, kCGImageAlphaPremultipliedFirst);
    
    CGColorSpaceRelease(rgbColorSpace);

    CGContextSetFillColorWithColor(context, [self CGColor]);
    CGContextFillRect(context, rect);

    CGImageRef cgImage = CGBitmapContextCreateImage(context);
    UIImage *image = [UIImage imageWithCGImage:cgImage scale:scale orientation:UIImageOrientationUp];
    CGImageRelease(cgImage);

    return image;
}