How to bring app to foreground programmatically

Question

I need a solution, how to bring a backgrounded app, what is listening for a signal to foreground, when this signal comes. Does anybody have any idea?

(I know this so

Answer 1

There's no way of doing that, not even in a way Apple would reject it.

Have you thought about notifications? when the signal triggers, you send a notifications, and when the user get that notification the app is opened again!