change opacity of button clicked swift
@IBAction func keyPressed(_ sender: UIButton) {
// sets opacity to half - you can change the opacity by editing "0.5"
sender.alpha = 0.5
/*
Code should execute after 0.2 second delay.
You can change delay by editing 0.2.
*/
DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
// Bring's sender's opacity back up to fully opaque
sender.alpha = 1.0
}
}