xcode - Calling Function from another class swift

Question

Im having trouble calling a function in my GameViewController.swift from another class, Menu.swift. I call the function like this:

class Menu: SKnode {

    func scoreAction(sender:UIButton!) { 
        self.buttonPlay.removeFromSuperview()
        self.buttonScore.removeFromSuperview()
         // CALLING FUNCTION
        GameViewController.showLeaderboard()    
     }
}

And here is the function I'm trying to call:

class GameViewController: UIViewController,
 UITextFieldDelegate, GKGameCenterControllerDelegate  {

   func showLeaderboard()
    {
      var gcViewController: GKGameCenterViewController = GKGameCenterViewController()
      gcViewController.gameCenterDelegate = self

      gcViewController.viewState = GKGameCenterViewControllerState.Leaderboards
      gcViewController.leaderboardIdentifier = "yourleaderboardid"

      self.presentViewController(gcViewController, animated: true, completion: nil)
    }

}

I have a Compiler Error inside my Menu class in the line GameViewController.showLeaderboard() "Missing argument for parameter #1 in call" But I don't understand what type of argument the compiler is expecting because I declared the function without any needing any parameters.

Thank you

Answer 1

In GameViewController you have defined scoreAction as instance method not the class function.You should call scoreAction by making instance of GameViewController

class Menu: SKnode {

    func scoreAction(sender:UIButton!) { 
        self.buttonPlay.removeFromSuperview()
        self.buttonScore.removeFromSuperview()
         // CALLING FUNCTION 
         //see () on GameViewController
        GameViewController().showLeaderboard()    
     }
}

I think you should load GameViewController from storyBoard if you have GameViewController in storyBoard