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→Adding the Navigation Code
Next we need to modify our root view controller so that the books table view is displayed when the user selects an author from the list. When a user selects an item from a Table View, the didSelectRowAtIndexPath method is called so we need to override this method in our view controller.
Edit the ''RootViewController.m'' file and begin by importing the ''BooksViewController.h'' interface header file for the books view controller and to then synthesize access to the booksController class:
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Remaining within the RootViewController.m filem file uncomment the template didSelectRowAtIndexPath method and modify it as follows:
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