UIColor+ColorDef.swift

import UIKit

typealias ColorDef = UInt32

extension UIColor {
    convenience init(_ colorDef: ColorDef) {
        self.init(colorDef: colorDef)
    }
    convenience init(colorDef: ColorDef) {
        self.init(colorDef: colorDef, alpha: 1.0)
    }
    convenience init(colorDef: ColorDef, alpha: CGFloat) {
        let blue = CGFloat(colorDef & 0xff) / CGFloat(255)
        let green = CGFloat(colorDef >> 8 & 0xff) / CGFloat(255)
        let red = CGFloat(colorDef >> 16 & 0xff) / CGFloat(255)
        self.init(red: red, green: green, blue: blue, alpha: alpha)
    }
}