Clamping camera around the background of a scene in SpriteKit

Question

so I have a base game setup that can be found at the bitbucket link below:

Game link

I\'m currently having a hard time understanding how to translate the cam

Answer 1

I didn't use your code. I made a sample project and got this working.

heres my code

import SpriteKit

class GameScene: SKScene {

    let world = SKSpriteNode(imageNamed: "world.jpg")
    let player = SKSpriteNode(color: SKColor.greenColor(), size: CGSizeMake(10, 10))

    var cam: SKCameraNode!

    override init(size: CGSize) {
        super.init(size: size)
        print(world.size)
        addChild(world)
        addChild(player)

        world.zPosition = 1
        player.zPosition = 2

        cam = SKCameraNode()
        self.camera = cam
        addChild(cam)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func touchesBegan(touches: Set, withEvent event: UIEvent?) {
        for touch: AnyObject in touches {
            let location = touch.locationInNode(self)

            player.position = location
        }
    }

    override func touchesMoved(touches: Set, withEvent event: UIEvent?) {
        for touch: AnyObject in touches {
            let location = touch.locationInNode(self)

            player.position = location
        }
    }

    func clampCamera(){

        func clamp(inout input: CGFloat, num1: CGFloat, num2: CGFloat) {
            if input < num1 {
                input = num1
            }
            else if input > num2 {
                input = num2
            }
        }

        let lBoundary = -world.size.width/2 + size.width/2
        let rBoundary = world.size.width/2 - size.width/2
        let bBoundary = -world.size.height/2 + size.height/2
        let tBoundary = world.size.height/2 - size.height/2

        clamp(&camera!.position.x, num1: lBoundary, num2: rBoundary)
        clamp(&camera!.position.y, num1: bBoundary, num2: tBoundary)

    }

    override func update(currentTime: NSTimeInterval) {
        camera!.position = player.position
        clampCamera()
    }
}

this is the same image i used as my "world" http://i.imgur.com/XhZbh8q.jpg