title: cocos2d swift how to show a sprite?
body: <p>So I have my scene presenting and am trying to display a sprite when I press a button. I know the function is called because of a NSLog but I can't get the sprite to show.</p>
  
  <pre><code>func ShowShip() {
  var booster = CCBReader.load("ccbResources/Booster")
  booster.position = CGPoint(x: 0, y: 0)
  self.addChild(booster)
  NSLog("created sprite")
  }
  </code></pre>
  
  <p>The log is called but the sprite isn't displayed. I looked at the quickstart tutorial and couldn't see much difference.</p>
  
  <p>edit: tried calling the .png resource directly but got unwrapping error</p>