I am embarrassed to have answered an iPhone question as though it were an OS X
problem. I was thrown by the reference to "the currently topmost windows
controller."
Still, the general principles hold:
This doesn't smell good for conformance to MVC, and that's a sign of trouble.
The view controllers should ideally listen for notifications or KVO events from
the model object. View controllers know when they've been made visible and
invisible; the one that knows it's visible can respond to the event.
If you REALLY MUST, have the application delegate keep a reference to the
navigation controller, so the object can ask the nav controller for its
frontmost view controller, and send its message to that. My caveat still holds
that I can't imagine this design being usable in the long run.
— F
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