startActivity.swift

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    CLSDataStore.shared.mainAppContext.descendant(matchingIdentifierPath: [game.identifier]) { context, _ in

        context?.becomeActive()
        if let activity = context?.currentActivity {
            activity.start()
        } else {
            context?.createNewActivity().start()
        }

        CLSDataStore.shared.save()
    }
}