Adding coins
Coins are more fun if there are two value variations. We will create two coins:
A Bronze Coin, worth one coin
A Gold Coin, worth five coins
The two coins will be distinguishable by their color, as seen here:
Creating the coin classes
We only need a single Coin class to create both denominations. Everything in the Coin class should look very familiar at this point. To create the Coin class, add a new file named Coin.swift and then enter the following code:
import SpriteKit
class Coin: SKSpriteNode, GameSprite {
var initialSize = CGSize(width: 26, height: 26)
var textureAtlas: SKTextureAtlas =
SKTextureAtlas(named: "Environment")
var value = 1
init() {
let bronzeTexture =
textureAtlas.textureNamed("coin-bronze")
super.init(texture: bronzeTexture, color: .clear,
size: initialSize)
self.physicsBody = SKPhysicsBody(circleOfRadius:
size.width / 2)
self.physicsBody?.affectedByGravity = false
}
// A function to transform this coin into...
