Creating Color Constants by Extending UIColor

SomeClass.swift

class SomeClass {
    var fancyColor = UIColor.customDarkGreen()
    var superFancyColor = UIColor.customLightGreen()
}

UIColorExtentions.swift

import UIKit

extension UIColor {
    class func customDarkGreen() -> UIColor {
        return UIColor(red: 0, green: 108/255, blue: 86/255, alpha: 1)
    }
    class func customLightGreen() -> UIColor {
        return UIColor(red: 0, green: 175/255, blue: 158/255, alpha: 1)
    }
    class func customDarkGray() -> UIColor {
        return UIColor(red: 95/255, green: 106/255, blue: 114/255, alpha: 1)
    }
    class func customWarmGray() -> UIColor {
        return UIColor(red: 233/255, green: 227/255, blue: 219/255, alpha: 1)
    }
}