To explore each of these access levels, we need to step outside our playground comfort zone and create a module. To hold our module and a playground that can use it, we will need to create an Xcode workspace:
- In Xcode, select File | New | Workspace... from the menu, as shown in the following screenshot:
- Give your Workspace a name, such as AccessControl, and choose a save location.
- You will now see an empty workspace:
In this workspace, we need to create a module, which represents something that tightly controls the information ...
