How can I make my iOS app continuously loop through a playlists of sounds?

Question

I'm trying to make an app that plays a series of chimes related to the content of an array, whenever all the chimes are played the app should start playing them again from the beginning of the array.

This is my code:

var counter = 0
var song = ["1","2","3","4"]

func music() {
    while counter < song.count {

        var audioPath = NSBundle.mainBundle().pathForResource("\(song[counter])", ofType: "wav")!
        var error : NSError? = nil
        player = AVAudioPlayer(contentsOfURL: NSURL(string: audioPath), error: &error)
        if error == nil {
            player.delegate = self
            player.prepareToPlay()
            player.play()
        }


        func audioPlayerDidFinishPlaying(player: AVAudioPlayer!, successfully flag: Bool) {
            if flag {
                counter++
            }
        }

        if ((counter + 1) == song.count) {
            counter = 0
        }

    }
}

How can I achieve this?

Answer 1

You don't need to have a loop here. The logic is the following: you play a music file, when this file is over you increment the counter and play the next file

var counter = 0
var song = ["1","2","3","4"]

func music()
{

var audioPath = NSBundle.mainBundle().pathForResource("\(song[counter])", ofType: "wav")!
var error : NSError? = nil
player = AVAudioPlayer(contentsOfURL: NSURL(string: audioPath), error: &error)
if error == nil {
    player.delegate = self
    player.prepareToPlay()
    player.play()
}

func audioPlayerDidFinishPlaying(player: AVAudioPlayer!, successfully flag: Bool)
{
    player.delegate = nil

    if flag {
        counter++
    }

    if ((counter + 1) == song.count) {
        counter = 0
    }

    music()
}

Answer 2

You can do this easily using an AVQueuePlayer…

let song = ["1","2","3","4"]

func music() {

    let items = song.compactMap {
        Bundle.main.url(forResource: "\($0)", withExtension: "wav")
    }.map {
        AVPlayerItem(url: $0)
    }

    let player = AVQueuePlayer(items: items)

    player.delegate = self
    player.play()
}