title: Do I need to suffix @3x in UIImage imageNamed?
body: <p>There are <code>iPhone 6</code> and <code>iPhone 6 plus</code> device available from apple.</p>
  
  <ul>
  <li>I have three pics including <code>@2x</code> and <code>@3x</code>. When I load image using <code>UIImage imageNamed:</code>. </li>
  <li>Do I need to add <code>@3x</code> ad the end of file? My naming convention is <code>pic.png</code>, <code>pic@2x.png</code>, <code>pic@3x.png</code>. </li>
  <li>Do I need to do like first check the running device is <code>iPhone 6</code> and then <code>[UIImage imageNamed:@"pic@3x.png"]</code> or just <code>[UIImage imageNamed:@"pic"]</code> and the device will automatically use the right image for the right device?</li>
  </ul>