How to do copy paste delete in Swift for macOS

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {
    @IBAction func copy(_ sender: Any) {
        print("copy", sender)
    }


    @IBAction func paste(_ sender: Any) {
        print("paste", sender)
    }
}

class MyWindow: NSWindow {
    override func keyDown(with event: NSEvent) {
        super.keyDown(with: event)

        guard
            let deleteScalar = UnicodeScalar(NSDeleteCharacter),
            event.charactersIgnoringModifiers == String(deleteScalar)
        else { return }

        NotificationCenter.default.post(Notification(name: .didKeyboardDeleteItem))
    }
}