Apple Game Frameworks and Technologies

Add a Physics Contact Extension

Inside the Extensions group, create a new file (⌘N) using the iOS Swift File template. Name the new file GameScene+PhysicsContact.swift and replace its contents with the following:

import SpriteKit

extension GameScene: SKPhysicsContactDelegate {
  func didBegin(_ contact: SKPhysicsContact) {
    let collision = contact.bodyA.categoryBitMask
      | contact.bodyB.categoryBitMask

    switch collision {
    default:
      break
    }
  }
}

This code is the start of your physics contact manager.

To keep the code organized and make it easier to see what contacts are taking place, you’ll use code comments. Add the following code just above the line that reads default::

  // MARK: - Player | Collectible ...