title: background color flash sprite kit
body: <p>I'm trying to make the background of the flashBackground flash white. How can i do this using sprite kit. I've created the SKSpriteNode below which i would like to flash from clearcolor to whitecolor to clearcolor.</p>
  
  <pre><code>flashBackground = [SKSpriteNode spriteNodeWithColor:[SKColor clearColor] size:
                         CGSizeMake(self.size.width, self.size.height)];
  
  [self addChild:flashBackground];
  </code></pre>