title: Programmatically switching to Landscape mode, and then back to landscape/portrtait mode
body: <p>I have a single-view app. It can be viewed in portrait and landscape mode. </p>
  
  <p>However, a button on the view should force the interface to be in Landscape-only mode. Another tap of the button would bring it back to landscape/portrait mode. </p>
  
  <p>Is there a way to achieve this?</p>