title: Change UIPopoverView background + arrow color
body: <p>Is there a way to <em>simply</em> change the UIPopoverView background color (including its arrow) on iOS8?</p>
  
  <p>(I did read a couple of articles on customizing "UIPopoverControllers". Does this apply here too, meaning the answer is "no"?)</p>
  
  <p><img src="https://i.stack.imgur.com/HL6Aa.png" alt="enter image description here"></p>
  
  <p>Isn't this something I should be able to address in the <strong>prepareForSegue</strong> method triggering the popover? How can I reach the according view to change its appearance?</p>