I have the code below and I am trying to make the pig on my screen move so I added a touch began function.

When I added in the function, it said that touch was never used and that I should replace it with a `_`. What am I doing wrong?

```
import SpriteKit
import UIKit

class GameScene: SKScene {
    var porker:Porker!
    var touchLocation = CGFloat()

    override func didMoveToView(view: SKView) {
        addBG()
        addPig()        
    }

    func addBG() {
        let bg = SKSpriteNode(imageNamed: "bg");
        addChild(bg)
    }

    func addPig() {
        let Pig = SKSpriteNode(imageNamed: "pig")
        porker = Porker(guy:Pig)
        addChild(Pig)
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
       /* Called when a touch begins */

         func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
            touch = touches.first!
        }
    }
}

```