title: Translucent Modal ViewController - how to handle rotation
body: <p>I would like to display a <code>UIViewController</code> modally and be able to see a blurred version of the view that presented it. </p>
  
  <p>Following a number of similar questions such as this:</p>
  
  <p><a href="https://stackoverflow.com/questions/19177348/ios-7-translucent-modal-view-controller">iOS 7 Translucent Modal View Controller</a></p>
  
  <p>I have added a background to my controller's view that is based on the captured view of the presenting controller. The problem I am facing is that my app supports multiple orientations and when the modal view is presented and rotated, the underlying background image no longer matches.</p>
  
  <p>I tried grabbing a fresh snapshot of the presenting viewController in <code>didRotateFromInterfaceOrientation:</code> of the modal viewController, but it appears that the UI of the presenting viewController is not being updated and the resulting image is still the wrong orientation. Is there any way to force redrawing of a view that is being hidden by the modal one?</p>