PhotoViewController: When in a splitview the PhotoView displays button to include the splitview  displayModeButton - to access the hidden master view.

splitViewController: willHideViewController: withBarButtonItem: forPopoverController: - is deprecated. Use of splitViewCpntroller.displayModeButton instead, however the text for the displayModeButton is based of the MasterView's title. Below are two ways to set this title.
 TopPlacesViewController: . Setting title of master view of splitter view in code here.
 Storyboard: Setting title of master view of splitter view it in storyboard.