I am working on a card game, using a MainCoordinator (2 other coordinators that are irrelevant here) and a state machine with 14 states, and trying to navigate using NotificationCenter.default, but my observers are not catching the messages I post. There are 4 player positions, which I call Left, Up, Right, and Down. I am only showing the code for the Left player, to simplify and shorten.

In MainCoordinator.swift, I have:

class MainCoordinator: Coordinator {
    var childCoordinators = [Coordinator]()
    var navigationController: UINavigationController
    let stateMachine: MyStateMachine
    var nc = NotificationCenter.default

    init(navigationController: UINavigationController) {
        self.navigationController = navigationController
        stateMachine = MyStateMachine(navController: navigationController, states: [...,PlayerLeftTurnState(),...])
    }

    func start() {
        let vc = ViewController.instantiate()
        vc.coordinator = self
        if navigationController.topViewController != vc {
            navigationController.pushViewController(vc, animated:false)
        }

    }

    func subscribeToNotifications() {
        nc.addObserver(self, selector: #selector(PlayerLeftTurnNotification), name: Notification.Name("playerLeftTurnNotification"), object: nil)
}

    @objc func PlayerLeftTurnNotification(notification: NSNotification) {
      stateMachine.enter(PlayerLeftTurnState.self)
    }

After I do my setup and deal the cards (in a Game.swift class), I try to post for the left player to take a turn

    var nc = NotificationCenter.default
    nc.post(name: Notification.Name("playerLeftTurnNotification"), object: nil)

This notification is not caught.

I tried adding a button to my main window, and having the IBAction post the same notification, but that is not caught either.

Any help greatly appreciated. Bill