title: SpriteKit - Making a sprite defy gravity (like a balloon)
body: <p>Does anyone have any idea how I can make my <code>SKSpriteNode</code> defy gravity? I thought of inverting the default gravity but realise I also need things to fall too!</p>
  
  <p>It seems like it should be easy but reading through the documentation I can’t see how I would do it!</p>
  
  <p>Thanks</p>