流れる画面を作りたいです。

ゲームで流れる画面を作りたいです。
以下のコードを実装しましたが、シミュレーターの画面が真っ暗のまま動いてくれません。
おかしいところを指摘していただけると幸いです。
よろしくお願いします。

swift
1
2import SpriteKit
3import GameplayKit
4
5class GameScene: SKScene {
6  
7  var baseNode:SKNode!
8  var coralNode:SKNode!
9  
10  override func didMove(to view: SKView) {
11    baseNode = SKNode()
12    baseNode.speed = 1.0
13    self.addChild(baseNode)
14    
15    coralNode = SKNode()
16    baseNode.addChild(coralNode)
17    
18    self.setupBackGroundSea()
19  }
20  
21  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
22  }
23  
24  override func update(_ currentTime: TimeInterval) {
25            // Called before each frame is rendered
26        }
27  
28  
29  
30  
31  
32  func setupBackGroundSea(){
33    
34    //背景画像
35    let texture = SKTexture(imageNamed:"background")
36    texture.filteringMode = .nearest
37    
38    //必要な画像枚数の算出
39    var needNumber = 2.0 + (self.frame.size.width/texture.size().width)
40  
41    
42    //アニメーション作成
43    let moveAnim = SKAction.moveBy(x: -texture.size().width, y: 0.0, duration: TimeInterval(texture.size().width/10.0))
44    let resetAnim = SKAction.moveBy(x: texture.size().width, y: 0.0, duration: 0.0)
45    let repeatForeverAnim = SKAction.repeatForever(SKAction.sequence([moveAnim,resetAnim]))
46    
47    //画像配置、アニメーション設定
48    while (needNumber > 0){
49      let sprite = SKSpriteNode(texture:texture)
50      sprite.zPosition = -100
51      sprite.position = CGPoint(x:needNumber * sprite.size.width,y:self.frame.size.height/2.0)
52      needNumber -= needNumber
53      baseNode.addChild(sprite)
54      sprite.run(repeatForeverAnim)
55    }
56    
57    
58  }

swift
1import UIKit
2import SpriteKit
3import GameplayKit
4
5class GameViewController: UIViewController {
6
7    override func viewDidLoad() {
8        super.viewDidLoad()
9        
10        if let view = self.view as! SKView? {
11            // Load the SKScene from 'GameScene.sks'
12            let scene = GameScene()
13                // Set the scale mode to scale to fit the window
14                scene.scaleMode = .aspectFill
15                scene.size = view.frame.size
16                
17                // Present the scene
18                view.presentScene(scene)
19          
20            
21            view.ignoresSiblingOrder = true
22            
23            view.showsFPS = true
24            view.showsNodeCount = true
25        }
26    }
27
28    override var shouldAutorotate: Bool {
29        return true
30    }
31
32    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
33        if UIDevice.current.userInterfaceIdiom == .phone {
34            return .allButUpsideDown
35        } else {
36            return .all
37        }
38    }
39
40    override func didReceiveMemoryWarning() {
41        super.didReceiveMemoryWarning()
42        // Release any cached data, images, etc that aren't in use.
43    }
44
45    override var prefersStatusBarHidden: Bool {
46        return true
47    }
48}
49