A new enemy - the Mad Fly

Pierre Penguin will need to dodge more than just Bees to accomplish his goal. We will add a few new enemies in this chapter, starting with the MadFly class. The Mad Fly is quite grumpy, as you can see:

Adding the MadFly class

MadFly is another straightforward class; it looks a lot like the bee code. Create a new Swift file named MadFly.swift and enter this code:

import SpriteKit

class MadFly: SKSpriteNode, GameSprite { 
var initialSize = CGSize(width: 61, height: 29) 
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("madfly"), 
textureAtlas.textureNamed...