Select a sound to play from a picker view

SoundSelectionViewController.swift

import UIKit
import AVFoundation

class SoundViewController: UIViewController {
    
    var sounds: [String] = ["island", "jingle", "starwars", "wind", "does_no_exist"] // Files that will possibly available to paly
    
    var selectedSoundString: String? = nil
    
    var player: AVAudioPlayer?
    
    @IBAction func play(_ sender: Any) {
        guard let selectedSoundString = selectedSoundString else {
            print("No selected sound to play...")
            return
        }
        
        guard let soundData = NSDataAsset(name: selectedSoundString) else {
            print("Asset is missing")
            return
        }
        
        do {
            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
            try AVAudioSession.sharedInstance().setActive(true)
            player = try AVAudioPlayer(data: soundData.data, fileTypeHint: AVFileTypeWAVE)
            player?.play()
        } catch {
            print(error)
        }
    }
    
    @IBAction func stop(_ sender: Any) {
        player?.stop()
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        selectedSoundString = sounds.first // picker view will always load with the first one selected, so let's just set the selected sound string now
        
    }
}

extension SoundViewController: UIPickerViewDataSource {
    
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return sounds.count
    }
    
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return sounds[row]
    }
}

extension SoundViewController: UIPickerViewDelegate {
    
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        selectedSoundString = sounds[row]
    }
}