UIButton Function add Tap Style - ios

Question

I Have written a function in Swift 4 which creates a button that receives the UIButton, a Color and a String for the title. I would like to add to this function a highlight or tap style but I am not sure how.
The function:
func homeBtn(button: UIButton, color: UIColor, title: String){
button.setTitle(title, for: .normal)
button.setTitleColor(color, for: .normal)
button.titleLabel?.font = UIFont(name: "Raleway-Medium", size: 24)
button.titleLabel?.lineBreakMode = .byWordWrapping
button.titleLabel?.textAlignment = .center
button.titleEdgeInsets = UIEdgeInsetsMake(20,20,20,20)
button.layer.borderColor = color.cgColor
button.layer.borderWidth = 2
button.layer.cornerRadius = button.frame.width/2
button.layer.backgroundColor = whiteColor.cgColor
}
The button is a circle and has a String centered in the middle with the UIColor being used as an outline. Can someone show me how to add a tap style to this function that uses the same UIColor to fill in the button and turn the text white please?

Answer 1

For the title color you can easily do this without adding events.
button.setTitleColor(.white, for: .highlighted)
button.setTitleColor(.black, for: .normal)
For the background color you need to define the following events:
button.addTarget(self, action: #selector(touchDown(button:)), for: .touchDown)
button.addTarget(self, action: #selector(touchUpInside(button:)), for: .touchUpInside)
Define functions - You can refer additional touch types as well - see UIControlEvents
#objc func touchDown(button: UIButton) {
guard let borderColor = button.layer.borderColor else {
return
}
button.backgroundColor = UIColor(cgColor: borderColor)
}
#objc func touchUpInside(button: UIButton) {
// Set backgroundColor for normal state...
}