Creating a project

Before we get coding, we'll assemble a window with a few buttons and a text field, which will facilitate trying out the code as we progress:

1. Create a new project using Xcode's Cocoa Application template.

2. Add six buttons and a text field to the View Controller Scene, arranged something like this:

As we move on, we'll make the buttons' titles a little more descriptive.

Creating the project's file manager

We won't put any file reading or writing capabilities in the ViewController class, since that's not its job, so we must create a class to manage file IO:

1. Create a new Swift file, and name it CustomFileManager.swift.
2. Add the following class definition to the new file:

class CustomFileManager 
{ 
  static let...