Renovating the GameScene class

We have made quite a few changes to our project. Luckily, this is the last major overhaul of the previous animation code. Moving forward, we will use the terrific structure we built in this chapter. At this point, your GameScene.swift file should look something like the following:

import SpriteKit

class GameScene: SKScene { 
    let cam = SKCameraNode() 
    let ground = Ground() 
    let player = Player() 

    override func didMove(to view: SKView) { 
self.anchorPoint = .zero 
self.backgroundColor = UIColor(red: 0.4, green: 0.6, blue: 
            0.95, alpha: 1.0) 

        // Assign the camera to the scene 
self.camera = cam 


        // Spawn our test bees: 
        let bee2 = Bee() 
bee2.position = CGPoint(x: 325, y: 325) 
self.addChild(bee2) 
        let bee3 = Bee() 
bee3.position = CGPoint(x: 200, y: 325) 
self.addChild(bee3) 

        // Add the ground to the scene: 
ground.position = CGPoint(x: -self.size.width * 2, y: 150) 
ground.size = CGSize(width: self.size.width * 6, 
               height: 0) 
ground.createChildren() 
self.addChild(ground) 

        // Add the player to the scene: 
player.position = CGPoint(x: 150, y: 250) 
self.addChild(player) 
    } 

    override func didSimulatePhysics() { 
        // Keep the camera centered on the player 
self.camera!.position = player.position
    } 
}

Run the project. You will see our new penguin hovering near the bees. Great work; we are now ready to explore the physics system with all of our new nodes. Your simulator should look something like this screenshot:

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Swift Game Development（Third Edition）

Renovating the GameScene class