UIColor+Hex.swift

extension UIColor {
    /// Init a UIColor base on the color hexadecimal value
    ///
    /// - Parameters:
    ///   - hex: Hexadecimal code of the color
    ///   - alpha: Alpha opacity, between 0 and 1
    public convenience init(hex: UInt, alpha: CGFloat) {
        self.init(
            red:    CGFloat((hex & 0xFF0000) >> 16) / 255.0,
            green:  CGFloat((hex & 0x00FF00) >> 8) / 255.0,
            blue:   CGFloat(hex & 0x0000FF) / 255.0,
            alpha:  alpha
        )
    }
}