调用另一个类swift的函数

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

我在我的GameViewController中调用一个函数有困难。另一个班的斯威夫特。我这样称呼这个函数:

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:

这就是我要调用的函数:

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)
    }

}

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.

在我的菜单类的line GameViewController.showLeaderboard()中有一个编译错误“在调用中缺少参数#1的参数”，但是我不理解编译器期望的参数类型，因为我声明了函数，不需要任何参数。

Thank you

谢谢你！

2 个解决方案

#1

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

在GameViewController中，你定义了scoreAction作为实例方法，而不是类函数。你应该通过创建GameViewController实例来调用scoreAction

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

我认为你应该从故事板中加载GameViewController如果你在故事板中有GameViewController

#2

If you want to perform any method on action in another class, you have to use protocol.

如果您想在另一个类中执行任何操作方法，您必须使用protocol。

//Outside 1st class

/ /外部一级

protocol abc {
     func xyz()
}

//Inside 1st class

/ /一级

var delegate: abc?

//Inside 1st class on action

//第一节课

self.delegate.xyz()

//Inside 2nd class you want to perform method

//在二班你要执行方法

extension 2nd: abc {
    func xyz(){
      //code 
   }
}

//Inside 2nd class where the instantiate process is performed

//在执行实例化过程的第二类内部

let obj = 2nd initialiser
obj.delegate = self

Hope this helps.

希望这个有帮助。

#1