A more SWIFT-friendly approach to getting components from an UIColor

UIColor+Components.swift

//
//  UIColor+Components.swift
//
//  Copyright (c) 2015 Stefan Jager
//  Permission is hereby granted, free of charge, to any person obtaining a
//  copy of this software and associated documentation files (the "Software"),
//  to deal in the Software without restriction, including without limitation
//  the rights to use, copy, modify, merge, publish, distribute, sublicense,
//  and/or sell copies of the Software, and to permit persons to whom the
//  Software is furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//  DEALINGS IN THE SOFTWARE.

import UIKit

extension UIColor
{
    /**
     Returns the components that make up the color in the RGB color space as a tuple.
     
     - returns: The RGB components of the color or `nil` if the color could not be converted to RGBA color space.
     */
    func getRGBAComponents() -> (red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat)?
    {
        var (red, green, blue, alpha) = (CGFloat(0.0), CGFloat(0.0), CGFloat(0.0), CGFloat(0.0))
        if self.getRed(&red, green: &green, blue: &blue, alpha: &alpha)
        {
            return (red, green, blue, alpha)
        }
        else
        {
            return nil
        }
    }
    
    /**
     Returns the components that make up the color in the HSB color space as a tuple.
     
     - returns: The HSB components of the color or `nil` if the color could not be converted to HSBA color space.
     */
    func getHSBAComponents() -> (hue: CGFloat, saturation: CGFloat, brightness: CGFloat, alpha: CGFloat)?
    {
        var (hue, saturation, brightness, alpha) = (CGFloat(0.0), CGFloat(0.0), CGFloat(0.0), CGFloat(0.0))
        if self.getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: &alpha)
        {
            return (hue, saturation, brightness, alpha)
        }
        else
        {
            return nil
        }
    }
    
    /**
     Returns the grayscale components of the color as a tuple.
     
     - returns: The grayscale components or `nil` if the color could not be converted to grayscale color space.
     */
    func getGrayscaleComponents() -> (white: CGFloat, alpha: CGFloat)?
    {
        var (white, alpha) = (CGFloat(0.0), CGFloat(0.0))
        if self.getWhite(&white, alpha: &alpha)
        {
            return (white, alpha)
        }
        else
        {
            return nil
        }
    }
}