Question

I have two controller classes A and B. A instantiates several of B. When the appropriate button is pressed in A, A instantiates a B and program flow is passed to B. At the end of B’s run I want it to pass some data back to A. How is this possible?

To be more precise, I have an NSArray of Objects, which I would like to return to ‘A’ after B runs its last method…

Answer 1

Lots of options:

1. Keep your data in a singleton DataManager object that both VCs can reference
2. Have B post an NSNotification that it is done, and have A be an observer for that notification, pass the data of interest in the notification.
3. Give B a reference to an iVar in A so it can directly set the values
4. Give B a reference to a method in A (possibly by declaring a protocol) so it can call that method and pass the data base that way.

Probably more, but these are the ones I use most often.