Question

I have finally managed to get core data working and beginning to understand it. So far I have just been playing in a window based app with core data enabled, playing inside the app delegate files.

But how can I access my managedObjectContext from outside the app delegate, for example if I had a UIView subclass?

Answer 1

Try using

[[[UIApplication sharedApplication] delegate] managedObjectContext];

To get rid of warnings, cast the delegate as your actual AppDelegate; for example,

NSManagedObjectContext *context = [(YourAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];

EDIT:

After you change up any data, you’ll need to save it. Here’s the method I use:

NSManagedObjectContext *moc = [self managedObjectContext];

NSError *error;
if (![moc save:&error]) {
    NSLog(@"Couldn't save current data in current method.");
}

Change up the log statement as you see fit.