Button extension for ColorStates

extension UIControlState : Hashable {
    public var hashValue: Int {
        return Int(self.rawValue)
    }
}

class MyButton : UIButton {

    public override var state: UIControlState {
        get {
            let currentState = super.state

            self.backgroundColor = self.backgroundColorsForState[currentState]

            return currentState
        }
    }

    private var backgroundColorsForState : [UIControlState : UIColor] =
        [UIControlState.normal : UIColor.clear,
         UIControlState.highlighted : UIColor.clear,
         UIControlState.disabled : UIColor.clear,
         UIControlState.selected : UIColor.clear,
         UIControlState.focused : UIColor.clear,
         UIControlState.application : UIColor.clear,
         UIControlState.reserved : UIColor.clear]

    public func setBackgroungColor(_ color: UIColor?, for state: UIControlState) {
        if let col = color {
            self.backgroundColorsForState[state] = col
        } else {
            self.backgroundColorsForState[state] = UIColor.clear
        }
        self.state
    }

}