To add the split view controller, you need to first remove any existing controllers and then set up the split view, master, and detail controllers. Follow these steps:
Main_iPad.storyboard in the standard editor configuration.
2. Select the existing view controller and delete it.
3. Drag the split view controller onto the storyboard. Doing this adds four controllers and three relationships, as shown in the zoomed-out storyboard of Figure 11-5.
The split view controller is added on the left. The top relationship is the master view controller. The current version ...