title: UIPopoverController backgroundColor back to default after rotation on iOS 8
body: <p>When setting <code>backgroundColor</code> to <code>[UIColor blackColor]</code> to a <code>UIPopoverController</code> everything is fine and presents correctly on iOS7 and iOS8.</p>
  
  <p>I present it via</p>
  
  <pre><code>    [aPopover presentPopoverFromBarButtonItem:self.navigationItem.rightBarButtonItem
                       permittedArrowDirections:UIPopoverArrowDirectionAny
                                       animated:YES];
  </code></pre>
  
  <p>After a device rotation, the popover <code>backgroundColor</code> is reset to default color (white in this case).</p>
  
  <p><strong>This does not happend in iOS 7. Only on iOS 8</strong></p>
  
  <p>I have already tried with </p>
  
  <pre><code>- (void)presentPopoverFromRect:(CGRect)rect 
                          inView:(UIView *)view 
        permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections 
                        animated:(BOOL)animated;
  </code></pre>
  
  <p>and a repositioning using <code>UIPopoverControllerDelegate</code> and the same problem occurs.</p>
  
  <p><strong>Last information :</strong> I had this problem only when displaying the popover on a UINavigationBar but not when presenting it on a regular <code>UIView</code> or any <code>UIButton</code>.</p>
  
  <p>Thanks for your help</p>