Another terror - Bats!

We are getting into quite a rhythm with creating new classes. Now, we will add a Bat to swarm with the Bees. The Bat is small, but has a very sharp fang:

Adding the Bat class

To add the Bat class, create a file named Bat.swift and add this code:

import SpriteKit 
 
class Bat: SKSpriteNode, GameSprite { 
    var initialSize = CGSize(width: 44, height: 24) 
    var textureAtlas:SKTextureAtlas = 
        SKTextureAtlas(named: "Enemies") 
    var flyAnimation = SKAction() 
 
    init() { 
        super.init(texture: nil, color: .clear, 
            size: initialSize) 
        self.physicsBody = SKPhysicsBody(circleOfRadius: 
            size.width / 2) 
        self.physicsBody?.affectedByGravity = false 
        createAnimations() 
        self.run(flyAnimation) 
    } 
 
    func createAnimations() { 
        let flyFrames:[SKTexture] = [ 
            textureAtlas.textureNamed...