How do I share an object between UIViewControllers on iPhone?

Question

My application is a tab bar application, with a separate view controller for each tab.

I have an object in my first view controller (A) which contains all my stored

Answer 1

Both view controllers should reference a third object (C) as their dataSource; this object (C) containing all the stored application data.

C would be, in this case, the M in the MVC.

Add to each of your ViewControllers the following declarations:

// SomeViewController.h
// Before @interface

@class MyDataSource;

// In the interface

IBOutlet MyDataSource *datasource;
@property(retain) IBOutlet MyDataSource *datasource;