Xcode iOS: How to communicate with other Controller?
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I have the following issue and need a patter to solve it:

To make it simple I have two views, the MasterViewController and the PreferencesController, the last one is an popup from the first. The PrefController has delegated some methods to the MasterController. 

But now I wanna catch a Popover-Event from the PreferencesController and inform the MasterController about it.

What is the best way to do it? I don't wanna use a delegate in the other direction now too, that doenst seem to be a good solution. I thought about creating an event for this, but you might have a better advice/solution for this situation.

Thanks in advance
