IPhone : Code missing in Swift for Playlist Browser (Treehouse Project)

I'm building my second-ever iPhone app with Treehouse Tutorials, and I've checked and double-checked with the tutorial's code. I can't find any differences, but mine isn't working. It feels as if something's missing...

From the PlaylistDetailViewController, which is the second view:

import UIKit

class PlaylistDetailViewController: UIViewController {

var playlist: Playlist?
//sets property to nil until we're ready to assign it
@IBOutlet weak var playlistCoverImage: UIImageView!
@IBOutlet weak var playlistTitle: UILabel!
@IBOutlet weak var playlistDescription: UILabel!

@IBOutlet weak var playlistArtist0: UILabel!
@IBOutlet weak var playlistArtist1: UILabel!
@IBOutlet weak var playlistArtist2: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    if playlist != nil {
        playlistCoverImage.image = playlist!.icon
        playlistCoverImage.backgroundColor = playlist!.backgroundColor
        playlistTitle.text = playlist!.title
        playlistDescription.text = playlist!.description

        playlistArtist0.text = playlist!.artists[0]
        playlistArtist1.text = playlist!.artists[1]
        playlistArtist2.text = playlist!.artists[2]

    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()

I feel there's something missing similar to this in the MasterViewController that calls the images and background colors:

 playlistArray += [playlistImageView0, playlistImageView1, playlistImageView2, playlistImageView3, playlistImageView4, playlistImageView5]

    for index in 0..<playlistArray.count { 
        let playlist = Playlist(index: index) //instance
        let playlistImageView = playlistArray[index]

        playlistImageView.image = playlist.icon
        playlistImageView.backgroundColor = playlist.backgroundColor
    } //gets all cover images and playlists


    playlistArray.append(playlistImageView0)

The playlistArray is never called in the DetailView, right? That's where the largeIcon, title, description, etc are...

Any ideas?