title: SpriteKit- How to zoom-in and zoom-out of an SKScene?
body: <p>If I'm making a game in SpriteKit that has a large "world", and I need the user to have the option of zooming in and out of the <code>SKScene</code>, how would I go about this? Or, to make things simpler, in the didMoveToView function, how can I present more of the world to the user's device's screen (without using <code>world.runAction(SKAction.scaleTo(0.5))</code> or something)?</p>