SoundPlayer.swift

import AVFoundation

class SoundPlayer {

    // Singleton in order to access the player from 'everywhere'
    class var sharedInstance : SoundPlayer {
        struct Static {
            static let instance : SoundPlayer = SoundPlayer()
        }
        return Static.instance
    }

    // Properties
    var error:NSError?
    var audioPlayer = AVAudioPlayer()
    let soundURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("sound", ofType: "wav")!) // Working
    //let soundURL = NSURL(string:"/System/Library/Audio/UISounds/sms-received1.caf") // Working too

    init() {
        AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryAmbient, error: nil)
        AVAudioSession.sharedInstance().setActive(true, error: nil)

        audioPlayer = AVAudioPlayer(contentsOfURL: soundURL, error: &error)

        if (error != nil) {
            println("[SoundPlayer] There was an error: \(error)")
        }
//        else {
//            audioPlayer.prepareToPlay()
//        }
    }

    func playSound() {
        if (audioPlayer.playing) {
            audioPlayer.stop()
        }
        audioPlayer.play()
    }
}