ios – Slow Response to Quick Succession Taps on UIButton & How to tap two buttons at once?


I’ve got a simple xylophone app I’m working with. When I try to tap a button several times in quick succession, a sound only plays for the first tap. Is there a way to decrease the response time required to play the sound?

Also, I’d like to be able to tap two or three buttons at once to play chords. How would I go about doing that?

I ran across this tutorial, is a UIGestureRecognizer the right approach?

Here’s my code:

import UIKit

import AVFoundation

class ViewController: UIViewController {
    var player: AVAudioPlayer!

    override func viewDidLoad() {

    @IBAction func keyPressed(_ sender: UIButton) {
        let soundName: String = sender.currentTitle!
        playSound(note: soundName)
        UIView.animate(withDuration: 0.2, delay: 0,
                       options: [],
                       animations: {
            sender.alpha = 0.5
        }, completion: { _ in
            sender.alpha = 1
    func playSound(note: String) {
        let url = Bundle.main.url(forResource: note, withExtension: "wav")
                player = try! AVAudioPlayer(contentsOf: url!)