CODEWITHSUNDEEP
swift
Raul Gonzalez
Raul Gonzalez

Reputation: 875

Calling function from another Swift class

I'm 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 needing any parameters.

Upvotes: 43

Views: 111796

Answers (2)

Pratyush Pratik Sinha
Pratyush Pratik Sinha

Reputation: 714

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

//Outside 1st class

protocol abc {
     func xyz()
}

//Inside 1st class

var delegate: abc?

//Inside 1st class on action

self.delegate.xyz()

//Inside 2nd class you want to perform method

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

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

let obj = 2nd() //2nd initialiser
obj.delegate = self

// if you want to use this scenario with table view cell in cellForRowAt
guard let cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCell", for: indexPath) as? TableViewCell else { return UITableViewCell() }
cell.delegate = self

Hope this helps.

Upvotes: 12

codester
codester

Reputation: 37189

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

Upvotes: 69

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