/Swift/Change opacity of button clicked swift

Change opacity of button clicked swift

@IBAction func keyPressed(_ sender: UIButton) {
  playSound(soundName: sender.currentTitle!)

  //Reduces the sender's (the button that got pressed) opacity to half.
  sender.alpha = 0.5

  //Code should execute after 0.2 second delay.
  DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
      //Bring's sender's opacity back up to fully opaque.
      sender.alpha = 1.0
  }
}

func playSound(soundName: String) {
    let url = Bundle.main.url(forResource: soundName, withExtension: "wav")
    player = try! AVAudioPlayer(contentsOf: url!)
    player.play()
}

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