sounds.swift

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioPlayerDelegate {
    
    var audioPlayer: AVAudioPlayer!
    let soundArray = ["note1.wav", "note2.wav", "note3.wav", "note4.wav", "note5.wav", "note6.wav", "note7.wav"]

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

    @IBAction func notePressed(_ sender: UIButton) {
        
        playSound(soundFileName: soundArray[sender.tag - 1])
        
    }
    
    func playSound(soundFileName : String) {
        let soundUrl = Bundle.main.url(forAuxiliaryExecutable: soundFileName)
        
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: soundUrl!)
        } catch {
            print(error)
        }
        
        audioPlayer.play()
    }
}