Q:

swift xcode play sound files from player list

I am looking for a swift coding playing sound out of the player list and not sounds added as resource to your project. 
 I mainly found the usage of
NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("sound_name", ofType: "wav"))
    println(alertSound)
but for this you need to have the sound file in your bundle.  But I couldn't find any example 
selecting audio files bought thru itunes and play them. 
Any idea how to do this?  Can I access my music layer playlist files and using them in my app? 
Thanks for any code lines. 
rpw

A:

These music files are represented by MPMediaItem instances.  To fetch them, you could use an MPMediaQuery, as follows:
let mediaItems = MPMediaQuery.songsQuery().items

At this point, you have all songs included in Music App Library, so you can play them with a MPMusicPlayerController after setting a playlist queue:
let mediaCollection = MPMediaItemCollection(items: mediaItems)

let player = MPMusicPlayerController.iPodMusicPlayer()
player.setQueueWithItemCollection(mediaCollection)

player.play()

You might need to filter songs by genre, artist, album and so on.  In that case, you should apply a predicate to the query before fetching the media items:
var query = MPMediaQuery.songsQuery()
let predicateByGenre = MPMediaPropertyPredicate(value: "Rock", forProperty: MPMediaItemPropertyGenre)
query.filterPredicates = NSSet(object: predicateByGenre)

let mediaCollection = MPMediaItemCollection(items: query.items)

let player = MPMusicPlayerController.iPodMusicPlayer()
player.setQueueWithItemCollection(mediaCollection)

player.play()

Cheers!