How to share a ManagedObjectContext when using UITabBarController

Question

I have an iPhone application that has a MainWindow.xib holding a UITabBarController, which in turn has a UINavigationController and a custom UIViewController subclass in its

Answer 1

Good, I looked long and hard at the CoreDataBooks sample application and did it like this:

• Created IBOutlets to the RootViewController (the top view controller of the UINavigationController) and the MapViewController (the custom view controller) in the app delegate.
• Connected the outlets to the view controllers in the MainWindow.xib

• Added the following code to applicationDidFinishLaunching:

  // pass the managed object context to the view controllers
  RootViewController *rootViewController = (RootViewController *)[navigationController topViewController];
  rootViewController.managedObjectContext = self.managedObjectContext;
  
  mapViewController.managedObjectContext = self.managedObjectContext;
  

And now it works like a charm.