从另一个类快速调用函数 [英] Calling Function from another class swift

问题描述

我无法从另一个类 Menu.swift 调用我的 GameViewController.swift 中的函数.我这样调用函数:

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()    
     }
}

这是我要调用的函数:

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)
    }

}

我的 Menu 类中有一个编译器错误，在 GameViewController.showLeaderboard() 行调用中参数 #1 缺少参数"但我不明白编译器期望什么类型的参数，因为我声明了该函数而无需任何参数.

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.

谢谢

推荐答案

在 GameViewController 中，您将 scoreAction 定义为 instance 方法而不是 class 函数.你应该通过创建GameViewController

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()    
     }
}

如果你在storyBoard中有GameViewController，我认为你应该从storyBoard加载GameViewController

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

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