Xylophone

Our Goal

The goal of this tutorial is to dive into a simple iOS recipe - how to play sound and use an Apple library called AVFoundation.

What you will create

You will be making your first musical instrument! A xylphone.

What you will learn

• How to play sound using AVFoundation and AVAudioPlayer.
• Understand Apple documentation and how to use StackOverflow.
• Functions and methods in Swift.
• Data types.
• Swift loops.
• Variable scope.
• The ViewController lifecycle.
• Error handling in Swift.
• Code refactoring.
• Basic debugging.

Replacement Code

import UIKit
import AVFoundation

class ViewController: UIViewController {
    
    var player: AVAudioPlayer!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func keyPressed(_ sender: UIButton) {
        playSound()
    }
    
    func playSound() {
        let url = Bundle.main.url(forResource: "C", withExtension: "wav")
        player = try! AVAudioPlayer(contentsOf: url!)
        player.play()
                
    }
}

Xylophone