Playing a sound with AVAudioPlayer

I'm trying to play a sound with AVAudioPlayer but it won't work.

Edit 1: Still doesn't work.

Edit 2: This code works. My device was in silent mode.

import UIKit
import AVFoundation

class ViewController: UIViewController {

    var audioPlayer = AVAudioPlayer()
                        
    override func viewDidLoad() {
        super.viewDidLoad()
    
        var alertSound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("button-09", ofType: "wav"))
        println(alertSound)
    
        var error:NSError?
        audioPlayer = AVAudioPlayer(contentsOfURL: alertSound, error: &error)
        audioPlayer.prepareToPlay()
        audioPlayer.play()
    }
}

Made modification to your code:

import UIKit
import AVFoundation

class ViewController: UIViewController {

    var audioPlayer = AVAudioPlayer()

    override func viewDidLoad() {
        super.viewDidLoad()
    
        var alertSound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("button-09", ofType: "wav"))
        println(alertSound)
    
        // Removed deprecated use of AVAudioSessionDelegate protocol
        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()
    }

}

Swift 3 and Swift 4.1:

import UIKit
import AVFoundation

class ViewController: UIViewController {
    private var audioPlayer: AVAudioPlayer?

    override func viewDidLoad() {
        super.viewDidLoad()

        let alertSound = URL(fileURLWithPath: Bundle.main.path(forResource: "button-09", ofType: "wav")!)
        print(alertSound)
    
        try! AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
        try! AVAudioSession.sharedInstance().setActive(true)
    
        try! audioPlayer = AVAudioPlayer(contentsOf: alertSound)
        audioPlayer!.prepareToPlay()
        audioPlayer!.play()
    }
}

As per Swift 2 the code should be

var audioPlayer : AVAudioPlayer!

func playSound(soundName: String)
{
    let coinSound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource(soundName, ofType: "m4a")!)
    do{
        audioPlayer = try AVAudioPlayer(contentsOfURL:coinSound)
        audioPlayer.prepareToPlay()//there is also an async version
        audioPlayer.play()
    }catch {
        print("Error getting the audio file")
    }
}

Your audio play will be deallocated right after viewDidLoad finishes since you assign it to a local variable. You need to create a property for it to keep it around.

The solution is for AudioPlayer which has play/pause/stop button in the navigation bar as bar button items

In Swift 2.1 you can use the below code

import UIKit
import AVFoundation
    
class ViewController: UIViewController {
    
    var player:AVAudioPlayer = AVAudioPlayer()

    override func viewDidLoad() {
            super.viewDidLoad()
            
            let audioPath = NSBundle.mainBundle().pathForResource("ARRehman", ofType: "mp3")
            var error:NSError? = nil
            do {
                player = try AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath: audioPath!))
            }
            catch {
                print("Something bad happened. Try catching specific errors to narrow things down")
            }
        
        }

    @IBAction func play(sender: UIBarButtonItem) {
        player.play()
        
    }
    
    
    @IBAction func stop(sender: UIBarButtonItem) {
        player.stop()
        print(player.currentTime)
        player.currentTime = 0
    }
    
    
    @IBAction func pause(sender: UIBarButtonItem) {
        
        player.pause()
    }
    
    
    @IBOutlet weak var sliderval: UISlider!
    
    
    @IBAction func slidermov(sender: UISlider) {
        
        player.volume = sliderval.value
        print(player.volume)
    }

}

This will work.....

import UIKit
import AVFoundation

class ViewController: UIViewController {

    var ding:AVAudioPlayer = AVAudioPlayer()

    override func viewDidLoad() {
        super.viewDidLoad()

        prepareAudios()
        ding.play()
    }

    func prepareAudios() {
        
        var path = NSBundle.mainBundle().pathForResource("ding", ofType: "mp3")
        ding = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath: path!), error: nil)
        ding.prepareToPlay()
    }
}

Use This Function to make sound in Swift (You can use this function where you want to make sound.)

First Add SpriteKit and AVFoundation Framework.

import SpriteKit
import AVFoundation
func playEffectSound(filename: String){
     runAction(SKAction.playSoundFileNamed("\(filename)", waitForCompletion: false))
}// use this function to play sound

playEffectSound("Sound File Name With Extension")
// Example :- playEffectSound("BS_SpiderWeb_CollectEgg_SFX.mp3")

This is a pretty old question, but I did not see an answer that worked with Swift 3.0 so I modernized the code and added some safety checks to prevent crashes.

I also took the approach of pulling the playing part out into its own function to help with re-use for anyone coming across this answer.

import UIKit
import AVFoundation

class ViewController: UIViewController {
    var audioPlayer: AVAudioPlayer?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        play(for: "button-09", type: "wav")
    }
    
    func play(for resource: String, type: String) {
        // Prevent a crash in the event that the resource or type is invalid
        guard let path = Bundle.main.path(forResource: resource, ofType: type) else { return }
        // Convert path to URL for audio player
        let sound = URL(fileURLWithPath: path)
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: sound)
            audioPlayer?.prepareToPlay()
            audioPlayer?.play()
        } catch {
            // Create an assertion crash in the event that the app fails to play the sound
            assert(false, error.localizedDescription)
        }
    }
}

Swift 4.2 onwards, AudioSession category setup options have been changed. (Try following code for Swift 4.2 onwards)

import UIKit
import AVFoundation


class ViewController: UIViewController {

    
    var audioPlayer: AVAudioPlayer?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        prepareAudioSession()
    }
    
    
    func prepareAudioSession() -> Void {
        do {
            try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback, mode: AVAudioSession.Mode.default, options: AVAudioSession.CategoryOptions.defaultToSpeaker)
            try AVAudioSession.sharedInstance().setActive(true)
            
            prepareAudioPlayer()
            
        } catch {
            print("Issue with Audio Session")
        }
    }
    
    
    func prepareAudioPlayer() -> Void {
        
        let audioFileName = "test"
        let audioFileExtension = "mp3"
        
        guard let filePath = Bundle.main.path(forResource: audioFileName, ofType: audioFileExtension) else {
            print("Audio file not found at specified path")
            return
        }
        
        let alertSound = URL(fileURLWithPath: filePath)
        try? audioPlayer = AVAudioPlayer(contentsOf: alertSound)
        audioPlayer?.prepareToPlay()
    }
    
    
    func playAudioPlayer() -> Void {
        audioPlayer?.play()
    }
    
    
    func pauseAudioPlayer() -> Void {
        if audioPlayer?.isPlaying ?? false {
            audioPlayer?.pause()
        }
    }
    
    
    func stopAudioPlayer() -> Void {
        if audioPlayer?.isPlaying ?? false {
            audioPlayer?.stop()
        }
    }
    
    func resetAudioPlayer() -> Void {
        stopAudioPlayer()
        audioPlayer?.currentTime = 0
        playAudioPlayer()
    }

}