How can I get around passing in 'self' to the showWindow method? - swift

Question

I'm working through a cocoa application tutorial from the Big Nerd Ranch's Cocoa Programming 5th edition book (I'm in the beginning chapters). On their blog website for discussing the book, a user mentions that passing in 'self' isn't necessary and that it's covered in chapter 18. I'm very curious now though as to how this could be refactored without having to pass in 'self'. Is it possible?
This code is basically creating an instance of a custom ViewController which will need to load from the AppDelegate.
import Cocoa
#NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {
var mainWindowController: MainWindowController?
func applicationDidFinishLaunching(_ aNotification: Notification) {
// Insert code here to initialize your application
let mainWindowController = MainWindowController()
//put the window of the window controller on the screen
mainWindowController.showWindow(self)
//set the property to point to the window controller
self.mainWindowController = mainWindowController
}
func applicationWillTerminate(_ aNotification: Notification) {
// Insert code here to tear down your application
}
}
MainWindowController class if you need to see the functionality. It's very basic, its not doing much:
import Cocoa
class MainWindowController: NSWindowController {
#IBOutlet weak var textField: NSTextField!
override var windowNibName: NSNib.Name {
return NSNib.Name.init("MainWindowController")
}
override func windowDidLoad() {
super.windowDidLoad()
// Implement this method to handle any initialization after your window controller's window has been loaded from its nib file.
}
#IBAction func generatePassword(_ sender: AnyObject) {
//Get a random string of length 8
let length = 8
let password = generateRandomString(length: length)
//tell the text field to display the string
textField.stringValue = password
}
}