Posting score to Game Center leaderboards

I am creating a game using swift on apple's Xcode 6 beta 6, and trying to add the high score of my game to gamecenter leader boards. I have created the leader boards in gamecenter.

So, how do I add my high score, which I saved as a NSUserDefault, to my gamecenter leader boards?

I tried using :

GKScore.reportScore([highScore], withCompletionHandler: nil)

but it just crashes. The initLeaderboard func has been deprecated in ios 8 so I'm not sure what to do.

First you have to create the GKScore object. Then you set the gkScore.value. Finally, you report the score.

// if player is logged in to GC, then report the score
if GKLocalPlayer.localPlayer().authenticated {
    let gkScore = GKScore(leaderboardIdentifier: "leaderBoardID")
    gkScore.value = score
    GKScore.reportScores([gkScore], withCompletionHandler: ( { (error: NSError!) -> Void in
        if (error != nil) {
            // handle error
            println("Error: " + error.localizedDescription);
        } else {
            println("Score reported: \(gkScore.value)")
        }
    }))
}