UIColor extension that add a whole bunch of utility functions.

UIColor+RGB.swift

//
//  UIColor+RGB.swift
//  Copyright (c) 2014 Massimiliano Bigatti. All rights reserved.
//

import Foundation
import UIKit

/**
    UIColor extension that add a whole bunch of utility functions like:

    - HTML/CSS RGB format conversion (i.e. 0x124672)
    - lighter color
    - darker color
    - color with modified brightness

 */
extension UIColor {
    /**
        Construct a UIColor using an HTML/CSS RGB formatted value and an alpha value
    
        :param: rgbValue RGB value
        :param: alpha color alpha value
    
        :returns: an UIColor instance that represent the required color
     */
    class func colorWithRGB(rgbValue : UInt, alpha : CGFloat = 1.0) -> UIColor {
        let red = CGFloat((rgbValue & 0xFF0000) >> 16) / 255
        let green = CGFloat((rgbValue & 0xFF00) >> 8) / 255
        let blue = CGFloat(rgbValue & 0xFF) / 255
        
        return UIColor(red: red, green: green, blue: blue, alpha: alpha)
    }
    
    /**
        Returns a lighter color by the provided percentage
    
        :param: lighting percent percentage
        :returns: lighter UIColor
     */
    func lighterColor(percent : Double) -> UIColor {
        return colorWithBrightnessFactor(CGFloat(1 + percent));
    }
    
    /**
        Returns a darker color by the provided percentage
        
        :param: darking percent percentage
        :returns: darker UIColor
    */
    func darkerColor(percent : Double) -> UIColor {
        return colorWithBrightnessFactor(CGFloat(1 - percent));
    }
    
    /**
        Return a modified color using the brightness factor provided
    
        :param: factor brightness factor
        :returns: modified color
    */
    func colorWithBrightnessFactor(factor: CGFloat) -> UIColor {
        var hue : CGFloat = 0
        var saturation : CGFloat = 0
        var brightness : CGFloat = 0
        var alpha : CGFloat = 0
        
        if getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: &alpha) {
            return UIColor(hue: hue, saturation: saturation, brightness: brightness * factor, alpha: alpha)
        } else {
            return self;
        }
    }
}

Thanks! Can I use this for another OSS Library?
I want to make pull request to https://github.com/ytakzk/Hokusai with this gist.