title: Detect when both the master and detail view controller are on screen?
body: <p>I have implemented a <code>UISplitViewController</code> using a Universal Storyboard in Xcode 6. <code>UISplitViewController</code> is supported on iPhone running iOS 8 now, and by default only one view controller will be on screen at a time.</p>
  
  <p>I need to know when both the master and detail view controllers are both on screen (iPad). I need to remove the disclosure indicators from <code>UITableViewCell</code>s in the case both are on screen - only render them when only the master view controller is on screen (iPhone), just like the Settings app.</p>
  
  <p>I could simply detect the device and only add them if it's an iPhone, but that's not recommended. It's possible a new device would display only one view controller and not identify as a phone. Another thought would be to detect if <code>self.splitViewController</code> is <code>nil</code>, but that won't work because it won't be <code>nil</code> on iPhone nor iPad because it actually is in a split view controller on iPhone.</p>
  
  <p><strong>Is it possible to detect when both the master and detail view controller are visible on screen at the same time?</strong></p>