用于处理UILocalNotifications的设计模式（如何知道用户在分支应用程序中的位置）

I have an app which uses UILocalNotifications (though the question would also be relevant to PushNotifications). When the user receives a local notification, depending on the state of the app and the choice they make in the notification alert, I want to present a specific viewController. The issue is they may currently be in a "pushed" viewController through a segue or in a modal ViewController and I am not currently tracking where the user is within the possible branches.I have an app which uses UILocalNotifications (