title: How to develop an universal app for iPhone + iPad without xib files?
body: <p>I want to make an universal build, but I create my UI entirely programmatically.</p>
  
  <p><strong>1)</strong> Can I add my different view controller classes to the device-specific resources directories? Or must classes be shared along both devices?</p>
  
  <p><strong>2)</strong> If I must share the classes along both devices, what's the safest way to conditionally load classA or classB depending on if it's an iPhone or iPad device?</p>