Game Development with Swift

Collecting coins

As a main goal for the player, collecting coins should be one of the most enjoyable aspects of our game. We will create a rewarding animation when the player contacts a coin. Follow these steps to implement coin collection:

1. In GameScene.swift, add a new property to the GameScene class:

   var coinsCollected = 0

2. In Coin.swift, add a new function to the Coin class named collect:

   func collect() { // Prevent further contact: self.physicsBody?.categoryBitMask = 0 // Fade out, move up, and scale up the coin: let collectAnimation = SKAction.group([ SKAction.fadeAlphaTo(0, duration: 0.2), SKAction.scaleTo(1.5, duration: 0.2), SKAction.moveBy(CGVector(dx: 0, dy: 25), duration: 0.2) ]) // After fading it out, move the coin out of the way // and ...