[iPhone] Call app delegate function from view controller

Question

I'm using the app delegate to manage the high scores for my iPhone game. I have a function in the app delegate called something like "getAString" which I'd like to call from a view controller. I tried:
[[[UIApplication sharedApplication] delegate] getAString];
It works but gives me a warning "getAString not found in protocol(s)" and "no -getAString method found". I assume this is because the application object thinks the delegate only implements the delegate protocol methods and doesn't know about any custom methods. Is there a different/better way to do this or a way to get rid of the warning?

Answer 1

jmzorko wrote:
I think you just need a simple cast:
[((YourAppDelegate *)[[UIApplication sharedApplication] delegate]) getAString];
... that is, if I grok your problem correctly
I have a similar problem, with this twist: the selector call is in shared-code and, hence, the [UIApplication sharedApplication] isn't of a known type. It is only known that it implements the shared callback and/or the myProtocol.
Coming from a Java background, I'd do something like this:
[((YourProtocol *)[[UIApplication sharedApplication] delegate]) getAString];
But, of course, in Obj-C, protocols aren't object-types, and objects don't "inherit" from protocols. So, what's the similar thing that I want to do, here?
Thanks!