UIButton customization in Swift

MyButton.swift

import UIKit

class MyButton: UIButton {

    override var highlighted: Bool {
        didSet {
            if (highlighted) {
                self.backgroundColor = UIColor.redColor()
            } else {
                self.backgroundColor = UIColor.clearColor()
            }
        }
    }
    
    override func drawRect(rect: CGRect) {
        super.drawRect(rect)
        self.layer.borderColor = UIColor.whiteColor().CGColor
        self.layer.borderWidth = 1.0
        self.layer.cornerRadius = 5.0
        self.clipsToBounds = true
        self.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)
    }
}