title: Changing master view and detail view from uisplitview
body: <p>On my storyboard, my project begins with a split view that automatically assigns my custom <code>UITableViewController</code> (embedded in a navigation controller) as the detail view controller (done by relationship segue). How do I access the split view controls from my custom <code>UITableViewController</code> so I can change the master view controller views as appropriate?</p>