title: iOS Retina display: images double size
body: <p>For testing not/retina display I've created an UIView with size 100x100.</p>
  
  <p>I've create 2 images:
  - normal size (100x100)
  - retina size (200x200)</p>
  
  <p>I have two situations:
  1) Non-Retina display + Normal Size image in background
  2) Retina display + Retina Size image in background</p>
  
  <p>The 1st scenario is ok.
  In the 2nd scenario the image is double size and in my UIView I can see only 1/4 of the total image.</p>
  
  <p>The same happens when I try to assign a background image to my UIViewController navigation bar as following:</p>
  
  <pre><code>if (IS_RETINA()) {
      [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:IMG_NAVIGATION_BAR_BACKGROUND_RETINA] forBarMetrics:UIBarMetricsDefault];
  }
  else {
      [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:IMG_NAVIGATION_BAR_BACKGROUND] forBarMetrics:UIBarMetricsDefault];
  }
  </code></pre>