Now, we will add one protocol and many classes we created in the previous chapter to generate the GameRepository class. We want to display a list of game names in the Picker View. We will add the following Swift source files in the project within the Chapter8 group:
EntityProtocol.swiftEntity.swiftRepository.swiftGame.swiftGameRepository.swift
Click on the Chapter8 group in Project Navigator (the icon represents a folder). Do not confuse it with the Chapter8 project that is the parent for the Chapter8 group. Navigate to File | New | File… and select Swift File as the template for your new file. Then, click on Next and enter EntityProtocol in the Save As textbox. Make sure that Chapter8 with the folder icon is selected in the Group drop-down menu, as shown in the next screenshot, and then click on Create. Swift will add the new EntityProtocol.swift source file to the Chapter8 group within the Chapter8 project:
Add the following...
