How can I override windowDidLoad method in a custom class in order get notified my window did load? - swift

Question

All I am trying in this question is about get notified when window itself did load, in order to try solve the issue i make a sub class of NSWindowController and named it as MyNSWindowController and put my needed code for solving the issue, but Xcode make an error of:
Cannot convert value of type 'NSWindowController' to specified type 'MyNSWindowController'
Here is my codes:
import Cocoa
import SwiftUI
class AppDelegate: NSObject, NSApplicationDelegate {
private var window: NSWindow!
func applicationDidFinishLaunching(_ aNotification: Notification) {
buildMainMenu()
buildWindow()
}
func buildWindow() {
window = NSWindow(
contentRect: NSRect(x: 0, y: 0, width: 100.0, height: 100.0),
styleMask: [.titled, .closable, .miniaturizable, .resizable, .fullSizeContentView],
backing: .buffered, defer: false)
window.setFrameAutosaveName("Main Window")
window.title = "No Storyboard Window"
window.makeKeyAndOrderFront(window)
window.center()
}
func buildMainMenu() {
let appMainMenu: NSMenu = NSMenu()
let mainMenu: NSMenuItem = NSMenuItem()
mainMenu.submenu = NSMenu(title: "MainMenu")
let mainMenuItem0 = NSMenuItem(title: "About", action: #selector(NSApplication.about), keyEquivalent: "a")
mainMenuItem0.keyEquivalentModifierMask = .command
let mainMenuItem1 = NSMenuItem(title: "Close", action: #selector(NSWindow.performClose(_:)), keyEquivalent: "w")
mainMenuItem1.keyEquivalentModifierMask = .command
let mainMenuItem2 = NSMenuItem(title: "Quit", action: #selector(NSApplication.shared.terminate(_:)), keyEquivalent: "q")
mainMenuItem2.keyEquivalentModifierMask = .command
mainMenu.submenu?.items = [mainMenuItem0, mainMenuItem1, mainMenuItem2]
appMainMenu.items = [mainMenu]
NSApp.mainMenu = appMainMenu
}
}
extension NSApplication {
#objc func about() {
AboutView().openInWindow(title: "About My App", sender: self)
}
}
struct AboutView: View {
var body: some View {
Color.green
.frame(width: 500, height: 200)
}
}
extension View {
#discardableResult
func openInWindow(title: String, sender: Any?) -> NSWindow {
let window = NSWindow(
contentRect: NSRect(x: 0, y: 0, width: 500.0, height: 500.0),
styleMask: [.titled, .closable, .miniaturizable, .resizable, .fullSizeContentView],
backing: .buffered, defer: false)
// let myNSWindowController: NSWindowController = NSWindowController(window: window)
let myNSWindowController: MyNSWindowController = NSWindowController(window: window)
window.makeKeyAndOrderFront(window)
window.center()
window.isReleasedWhenClosed = false
window.setFrameAutosaveName("Main Window")
window.title = "No Storyboard Window"
window.contentView = NSHostingView(rootView: self)
return window
}
}
class MyNSWindowController: NSWindowController {
override func windowDidLoad() {
print("Window did load!")
}
}
If you think my plan is not good about get notified when window get load, you can come with better answer for solving the issue and goal, I have to say I am trying to find a native way in Cocoa to work as .onAppear modifier which we have in SwiftUI. In SwiftUI .onAppear modifier is for content of view, here in this question i just want to know when the window did load or appear, just the window itself not what carry this window.