Cocoa Programming for OS X: The Big Nerd Ranch Guide

Create the Window Controller

Create a new NSWindowController subclass called ConfigurationWindowController along with a corresponding XIB. Navigate to File → New → File.... In the presented sheet, select Source from the OS X section and select Cocoa Class from the resulting options. Click Next. Enter ConfigurationWindowController in the Class field, and enter NSWindowController in the Subclass of field. Ensure that the checkbox labeled Also create XIB file for user interface is checked, and that Swift is the selected Language.

In ConfigurationWindowController.swift, add properties that you will bind the UI to, override windowNibName to load the proper NIB, and stub out the button action methods:

import Cocoa class ConfigurationWindowController: ...