Info is not being passed between views

import UIKit
class PlaylistDetailViewController: UIViewController {
    @IBOutlet weak var pressedLabel: UILabel!
    var seguelabel: String?
    override func viewDidLoad() {
        super.viewDidLoad()
        if seguelabel != nil {
            pressedLabel.text=seguelabel
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

import UIKit
class PlaylistMasterViewController: UIViewController {
    @IBOutlet weak var button: UIButton!
    @IBOutlet weak var playlistImage0: UIImageView!
    override func viewDidLoad() {
        super.viewDidLoad()
        button.setTitle("Happy Mothers Day!", forState: .Normal)
        let playlist=Playlist(index: 0)
        playlistImage0.image=playlist.icon
        playlistImage0.backgroundColor = playlist.backgroundColor
        // Do any additional setup after loading the view, typically from a nib.
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "showPlaylistDetail" {
            let playlistDetailController = segue.destinationViewController as!  PlaylistDetailViewController
            playlistDetailController.seguelabel = "You have pressed the button"
        }
    }
}