Step 3: Add a Vertical Split View

The Vermont Recipes application specification tells you that the application uses Core Data to manage a database of recipes. A traditional user interface for databases on the Macintosh is what some have called a master-master-detail view. A well-known example is iTunes. Its main window has a vertical pane down the left side holding categories and subcategories in an outline view. When you select the Music Library, a pane across the top of the right pane holds a table view where you can select genres, artists, and albums. A third pane below it contains detailed information that changes to reflect the artist or other item selected in the top pane. You can move the divider between any two panes to the left or right or up and down to change the relative sizes of the panes. In this recipe, you adopt the master-master-detail model for the main recipes window.

For now, create the split views without content. Subviews and controls for the two panes will come later, starting with a Tab View object in Step 5.