title: UISplitViewController: How to force showing the master ViewController
body: <p>I am using a <code>UISplitViewController</code>, with the <strong>master</strong> and the <strong>detail</strong> viewcontrollers, without <code>UINavigationControllers</code>.</p>
  <p>In some cases (for example when clicking on a universal link), I would like to force the app to always show the master viewcontroller.</p>
  <p>How can I do that?</p>
  <p>Is there a way to switch back from detail to master programmatically?</p>