UIColor convenience initializer, taking hex as an argument

UIColor+Extensions.swift

import UIKit

extension UIColor {
  convenience init(hex: Int) {
    let red = CGFloat((hex & 0xFF0000) >> (4 * 4))/0xFF
    let green = CGFloat((hex & 0x00FF00) >> (4 * 2))/0xFF
    let blue = CGFloat(hex & 0x0000FF)/0xFF
    self.init(red: red, green: green, blue: blue, alpha: 1)
  }
}