title: How do I use whiteColor in Swift and SpriteKit
body: <p>I'm running Yosemite and Xcode 6.  I created a new project using the "Game" option, SpriteKit and Swift.</p>
  
  <p>In the override for didMoveToView() in GameScene.swift I added the following line to try to change the back ground color:</p>
  
  <pre><code>self.backgroundColor = SKColor(whiteColor)
  </code></pre>
  
  <p>This compiles but won't run, stopping with the error "Use of unresolved identifier 'whiteColor'"</p>
  
  <p>The only import is:</p>
  
  <pre><code>import SpriteKit
  </code></pre>
  
  <p>Do I need another import to get whiteColor defined (which I assume is a constant in a header file somewhere ?</p>