IPhone app, Singletons, passing messages between ViewControllers & application design?

I haven't coded too many core data applications, however, I can tell you that singletons are appropriate for handling global data that youer classes need to access. This is the preferred method as opposed to the appdelegate method.

Here is a good article to read up on Singletons vs AppDelegates. It explains why Singletons in most cases are a better way to implement global access variables, then with the usage of AppDelegates.

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