Question

i’m working on an app with core data with storyboard. the app has uitabbarcontroller as rootview. i have created entity and generated the classes. each tab has it own uinavigation controller. the view in the tab 1 just saves some data in the database from uilabels. and it works fine and data is in the database.
the view in tab 2 displays the data from the database in uitableview. the data is only shown when i kill the app and restart it. so the ui table doesnt get refreshed.
first method: i have passed the managedobject context from the app delegate to the both views. so ui table doesnt get refreshed till kill and restart.
second method: i (mis)used the app delegate, but still the same result.

MyApplicationDelegate *appDelegate = (MyApplicationDelegate *)[[UIApplication sharedApplication] delegate];

how can one achieve that one view only adds data to core data(which it does right now) and the second view get notified of changes and display it in uitableview?

edit

-(NSFetchedResultsController *) fetchedResultsController
{
if (__fetchedResultsController != nil) {
    return __fetchedResultsController;
}

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];

NSEntityDescription *entity = [NSEntityDescription entityForName:@"Favis" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];

NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"chapterid" ascending:NO];
NSArray *sortDescriptors = [NSArray arrayWithObjects:sortDescriptor, nil];

[fetchRequest setSortDescriptors:sortDescriptors];

[NSFetchedResultsController deleteCacheWithName:@"Master"];
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@"Master"];
aFetchedResultsController.delegate = self;

self.fetchedResultsController = aFetchedResultsController;


NSError *error = nil;
if (![self.fetchedResultsController performFetch:&error]) {
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    abort();
}

return __fetchedResultsController;
}

it is the code when you use the core data template. only tweaked to work with my app. i have it in my both viewcontroller.

edit 2

i have implemented nsfetchedresultcontroller in my uitableview controller.
the manged object returns the exact number of data in the database, but ui table doesnt get refreshed. i also did [self.tableview reloaddata] but no luck

Answer 1

In the viewController with the UITableVIew implement the methods for the NSFetchedResultsControllerDelegate. The documentation has the full implementation of those methods.

And then make your viewController the delegate of the NSFetchedResultsController fetchedResultsController.delegate = self;