Make A SpriteNode Move along a certain Path

PathfiningAction.swift

//: A SpriteKit based Playground

import PlaygroundSupport
import SpriteKit

extension CGPoint {
    static func CenterOfScene(_ scene: GameScene) -> CGPoint {
        return CGPoint(x: scene.size.width / 2, y: scene.size.height / 2)
    }
}
class GameScene: SKScene {
    
    private var player : SKShapeNode?
    
    var squarePath : SKAction = {
        let action = SKAction()
        let square = UIBezierPath(rect: CGRect(x: 0, y: 0, width: 200, height: 200))
        let path : CGPath = square.cgPath
        return SKAction.follow(path, duration: 3)
    }()
    
    var circularPath : SKAction = {
       let action = SKAction()
        let rect = CGRect(x: 0, y: 0, width: 200, height: 200)
        let circle = UIBezierPath(roundedRect: rect, cornerRadius: 100)
        let path = circle.cgPath
        return SKAction.follow(path, duration: 3)
    }()
    
    override func didMove(to view: SKView) {
        player = SKShapeNode(rectOf: CGSize(width: 70, height: 70))
        player?.position = CGPoint.CenterOfScene(self)
        addChild(player!)
    }
    
    func touchDown(atPoint pos : CGPoint) {
        player?.run(SKAction.repeatForever(SKAction.sequence([squarePath, circularPath, squarePath.reversed(), circularPath.reversed()])))
    }
}
// Load the SKScene from 'GameScene.sks'
let sceneView = SKView(frame: CGRect(x:0 , y:0, width: 640, height: 480))
let scene = GameScene(size: sceneView.frame.size)
    // Set the scale mode to scale to fit the window
    scene.scaleMode = .aspectFill
    
    // Present the scene
    sceneView.presentScene(scene)

PlaygroundSupport.PlaygroundPage.current.liveView = sceneView