Swift - Sort artistsQuery By Album

Question

I want to sort the artists query by album like the Music app. How can I do that?

var artistsQuery = MPMediaQuery.artistsQuery()
var artistsQuery.groupingType = MPMediaGrouping.AlbumArtist
var songsByArtist = artistsQuery.collections

Answer 1

This code will create a mutable array. The artistsItemsSortedByAlbum.count equals the amount of artists & the artistsItemsSortedByAlbum[index].count equals the amount of albums.

         var artistsItemsSortedByAlbum = NSMutableArray()

         for var i = 0; i < artists.count; i++ {
            let collection:MPMediaItemCollection = artists[i] as! MPMediaItemCollection
            let rowItem = collection.representativeItem!

            let albumsQuery = MPMediaQuery.albumsQuery()
            let albumPredicate:MPMediaPropertyPredicate = MPMediaPropertyPredicate(value: rowItem.valueForProperty((MPMediaItemPropertyAlbumArtist)), forProperty: MPMediaItemPropertyAlbumArtist)
            albumsQuery.addFilterPredicate(albumPredicate)

            let artistAlbums = albumsQuery.collections
            artistsItemsSortedByAlbum.addObject(artistAlbums!)
        }