title: How to use xcAssets slicing in xCode 5?
body: <p>I am wondering how to use slicing in xCassets to minimize the number of resources for UINavigationBar.</p>
  
  <p>I set up a normal one (320x64) and a retina one (640x128) with a logo in the very center and a solid background color. With appropriate stretching, this two ones should be enough to fit also iPad width, iOS6 and iOS7 variations, etc.</p>
  
  <p>I would like the center logo not to be stretchable and everything around to be so in order for the image to work for non iOS7 nav bar (320x44 &amp; 640x88), for iPad (width 768 px and 1536 for retina).</p>
  
  <p>Using the slicing option, I tried to define different window ... any one helped me to achieve my goals and I think this is not very well documented.</p>