We will have two ViewController subclasses:

• MasterViewController: This will list Todo items
• DetailViewController: This will present and modify details of each item

Also, we will need ViewController scenes in our main storyboard. The following screenshot shows our storyboard:

We are not going to go through the storyboard and related scenes in detail as we assume that the reader is already familiar with these concepts. Storyboards can be downloaded from the GitHub repository of the book (https://github.com/PacktPublishing/Swift-Functional-Programming).