AVAudioPlayer not playing audio in Swift

Question

I have this code in a very simple, single view Swift application in my ViewController:

var audioPlayer = AVAudioPlayer()

@IBAction func playMyF         


        

Answer 1

for some reason (probably a bug) Xcode can't play certain music files in the .m4a and the .mp3 format I would recommend changing them all to .wav files to get it to play

//top of your class
var audioPlayer = AVAudioPlayer

//where you want to play your sound
let Sound = NSURL(fileURLWithPath: Bundle.main.path(forResource: "sound", ofType: "wav")!)
    do {
        audioPlayer = try AVAudioPlayer(contentsOf: Sound as URL)
        audioPlayer.prepareToPlay()
    } catch {
        print("Problem in getting File")
    }
    audioPlayer.play()

Answer 2

There's so much wrong with your code that Socratic method breaks down; it will probably be easiest just to throw it out and show you:

var player : AVAudioPlayer! = nil // will be Optional, must supply initializer

@IBAction func playMyFile(sender: AnyObject?) {
    let path = NSBundle.mainBundle().pathForResource("audioFile", ofType:"m4a")
    let fileURL = NSURL(fileURLWithPath: path)
    player = AVAudioPlayer(contentsOfURL: fileURL, error: nil)
    player.prepareToPlay()
    player.delegate = self
    player.play()
}

I have not bothered to do any error checking, but the upside is you'll crash if there's a problem.

One final point, which may or may not be relevant: not every m4a file is playable. A highly compressed file, for example, can fail silently (pun intended).

Answer 3

Based on @matt answer but little bit detailed 'cause original answer did not completely satisfied me.

import AVFoundation

class YourController: UIViewController {

  private var player : AVAudioPlayer?

  override func viewDidLoad() {
     super.viewDidLoad()

     prepareAudioPlayer()
  }

  @IBAction func playAudio() {

      player?.play()
  }
}

extension YourController: AVAudioPlayerDelegate {}

private extension YourController {

    func prepareAudioPlayer() {

        guard let path = Bundle.main.path(forResource: "you-audio", ofType:"mp3") else {
            return
        }
        let fileURL = URL(fileURLWithPath: path)
        do {
            player = try AVAudioPlayer(contentsOf: fileURL)
        } catch let ex {
            print(ex.localizedDescription)
        }
        player?.prepareToPlay()
        player?.delegate = self
    }
}

Answer 4

var audioPlayer = AVAudioPlayer()
var alertSound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("KiepRongBuon", ofType: "mp3")!)
        AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: nil)
        AVAudioSession.sharedInstance().setActive(true, error: nil)
        var error:NSError?
        audioPlayer = AVAudioPlayer(contentsOfURL: alertSound, error: &error)
        audioPlayer.prepareToPlay()
        audioPlayer.play()