Swift AVAudioPlayer

AudioPlayer

class Sound : NSObject {

    /// The player.
    var avPlayer:AVAudioPlayer!
    
    /**
    Uses AvAudioPlayer to play a sound file. 
    The player instance needs to be an instance variable. Otherwise it will disappear before playing.
    */
    func readFileIntoAVPlayer() {
        
        var error: NSError?
        let fileURL:NSURL = NSBundle.mainBundle().URLForResource("Sumer Is Icumen In", withExtension: "caf")
        
        // the player must be a field. Otherwise it will be released before playing starts.
        self.avPlayer = AVAudioPlayer(contentsOfURL: fileURL, error: &error)
        if avPlayer == nil {
            if let e = error {
                println(e.localizedDescription)
            }
        }
        
        println("playing \(fileURL)")
        avPlayer.delegate = self
        avPlayer.prepareToPlay()
        avPlayer.volume = 1.0
        avPlayer.play()
    }
    
    func stopAVPLayer() {
        if avPlayer.playing {
            avPlayer.stop()
        }
    }

    func toggleAVPlayer() {
        if avPlayer.playing {
            avPlayer.pause()
        } else {
            avPlayer.play()
        }
    }
}

// MARK: AVAudioPlayerDelegate
extension Sound : AVAudioPlayerDelegate {
    func audioPlayerDidFinishPlaying(player: AVAudioPlayer!, successfully flag: Bool) {
        println("finished playing \(flag)")
    }
    
    
    func audioPlayerDecodeErrorDidOccur(player: AVAudioPlayer!, error: NSError!) {
        println("\(error.localizedDescription)")
    }

}