I have a image named `background.png`. I have tried to add it to my scene from a SKS file, and it showed up fine in xcode, but in the simulator, no images showed up at all. Then, I have tried to do it by code, but even then, nothing showed up. Also, I got no error messages in the console saying that images weren't found. The screen was just completely black. Here is my code:

```
var background = SKSpriteNode(imageNamed: "background.png")
background.size.width = (background.size.width * frame.height) / background.size.height
background.size.height = frame.size.height
background.position.x = (background.size.width / 2)
background.position.y = frame.midY
background.zPosition = 0

let moveAnimation = SKAction.move(by: CGVector(dx: -background.size.width, dy: 0), duration: 10)
let shiftAnimation = SKAction.move(by: CGVector(dx: background.size.width, dy: 0), duration: 0)
let animateForever = SKAction.repeatForever(SKAction.sequence([moveAnimation, shiftAnimation]))
background.run(animateForever)

self.addChild(background)

background = SKSpriteNode(imageNamed: "background.png")
background.size.width = (background.size.width * frame.height) / background.size.height
background.size.height = frame.size.height
background.position.x = (background.size.width / 2)*3
background.position.y = frame.midY
background.zPosition = 0
background.run(animateForever)

self.addChild(background)

background = SKSpriteNode(imageNamed: "background.png")
background.size.width = (background.size.width * frame.height) / background.size.height
background.size.height = frame.size.height
background.position.x = -(background.size.width / 2) + 2
background.position.y = frame.midY
background.zPosition = 0
background.run(animateForever)

self.addChild(background)

```

Any help would be appreciated.