Does AppSync Subscription Work When User is No Longer in View Controller or when App is Background

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I am reading this sample app, and noticed that the call for subscriptions happens in viewDidLoad(). This raises the following question:

1) Is the user subscribed to event comments only when he/she is in that particular view controller? In other words, if the user navigates to another scene, is the subscription no longer in effect? How can I make it so that once a user subscribes to something, he/she is subscribed to it until told to stop?

I also have another question:

2) Can I changed the parameters passed to a subscription during the app? For instance, if I am subscribing to multiple events, then I would pass an array of event_id as parameter. For some condition, I will add an event to the array. So each time I add an event, do I have to restart the subscription?

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