how do make the background image on Xcode 6 swift - xcode

Question

Does anyone know what the code would be to make a background image that would cover the whole GameScene.swift
This is my code atm -
import SpriteKit
class GameScene: SKScene {
let playbutton = SKSpriteNode (imageNamed: "play")
let score = SKSpriteNode (imageNamed: "score")
var background = SKSpriteNode (imageNamed: "background")
override func didMoveToView(view: SKView) {
func loadBackGround()
{
background = SKSpriteNode(imageNamed: "background")
background.name = "background"
background.zPosition = 1.0
background.size = self.scene.size
scene.addChild(background)
}
self.playbutton.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
self.addChild(self.playbutton)
self.score.position = CGPointMake(CGRectGetMidX(self.frame), 100)
self.addChild(self.score)

Answer 1

You may have to be more specific (iOS Game, Mac Game...), but I think something like this should work:
var bgImage:SKSpriteNode
func loadBackGround()
{
bgImage = SKSpriteNode(imageNamed: "BACKGROUND IMAGE NAME")
bgImage.name = "bg"
bg.size = self.scene.size
scene.addChild(bg)
}
(you can use it outside of a function of course)
EDIT: Try this code:
import SpriteKit
class GameScene: SKScene {
let playbutton = SKSpriteNode (imageNamed: "play")
let score = SKSpriteNode (imageNamed: "score")
var background = SKSpriteNode ()
func loadBackGround() // You define the function and what it does
{
background = SKSpriteNode(imageNamed: "background")
background.name = "background"
background.size = self.scene.size
scene.addChild(background)
}
override func didMoveToView(view: SKView) {
loadBackGround() // You call the function you defined
self.playbutton.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
self.addChild(self.playbutton)
self.score.position = CGPointMake(CGRectGetMidX(self.frame), 100)
self.addChild(self.score)
}

Answer 2

This is the way I use:
override init(size: CGSize) {
super.init(size: size)
anchorPoint = CGPoint(x: 0.5, y: 0.5)
let background = SKSpriteNode(imageNamed: "Background")
addChild(background)
}
This loads the background image from the asset catalog and places it in the scene. Because the scene’s anchorPoint is (0.5, 0.5), the background image will always be centered on the screen on both 3.5-inch and 4-inch devices.
I get this from a good tutorial: How to Make a Game Like Candy Crush with Swift Tutorial: Part 1