Build wit CoreGraphics UIImage

CoreGraphics UIImage.c

- (UIImage*) buildSwatch: (int) aBrightness
{
    CGRect rect = CGRectMake(0.0f, 0.0f, 30.0f, 30.0f);
    UIGraphicsBeginImageContext(rect.size);
    
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:4.0f];
    [[[UIColor blackColor] colorWithAlphaComponent:(float) aBrightness / 10.0f] set];
    [path fill];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return image;
}