7
Tengo dificultades para implementar 2 nsfetchedresultsController en un tableView. Yo quería un fetchedresultsController en cada sección de la mesa (2 secciones), algo como esto:
Multiple NsfetchedResultsController en un UItableView
Lista
- producto
- producto2
Comprado
- product3
Sé que para este ejemplo no necesitaría 2 nsfetchedResultsController pero necesitaré esto más adelante ..
cuando quito un producto de uno nsfetchedResultsController pasa a la otra y me sale este error:
Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (0) must be equal to the number of rows contained in that section before the update (0), plus or minus the number of rows inserted or deleted from that section (1 inserted, 0 deleted). with userInfo (null)"
que piensa que esto ocurre porque cuando la primera fetchedRController detecta un cambio actualiza el tableView antes de que el segundo se llama es así? ¿Debo usar NSMutableArrays y actualizar TableView manualmente?
El código:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSInteger numberOfRows = 0;
switch (section)
{
case WISHLIST_SECTION:
{
numberOfRows =[[fetchedResultsControllerwish fetchedObjects]count];
};
break;
case PURCHASED_SECTION:
{
numberOfRows =[[fetchedResultsControllerPurchased fetchedObjects]count];
};
break;
default:
break;
}
return numberOfRows;
}
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
// The fetch controller is about to start sending change notifications, so prepare the table view for updates.
[self.tableView beginUpdates];
}
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
// The fetch controller has sent all current change notifications, so tell the table view to process all updates.
[self.tableView endUpdates];
}
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
newIndexPath:(NSIndexPath *)newIndexPath {
UITableView *tableViewT = self.tableView;
switch(type) {
case NSFetchedResultsChangeInsert:
[tableViewT insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeDelete:
[tableViewT deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeUpdate:
[self configureCell:(GiftEventTableViewCell *)[tableViewT cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
break;
case NSFetchedResultsChangeMove:
[tableViewT deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationFade];
[tableViewT insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
withRowAnimation:UITableViewRowAnimationFade];
break;
}
}
-(void)configureCell:(GiftEventTableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
switch (indexPath.section) {
case WISHLIST_SECTION:
{
GiftEvent *giftEv=(GiftEvent *)[fetchedResultsControllerwish objectAtIndexPath:indexPath];
cell.gift=giftEv;
};
break;
case PURCHASED_SECTION:
{
GiftEvent *giftEv=(GiftEvent *)[fetchedResultsControllerPurchased objectAtIndexPath:indexPath];
//if i don't use indexpath.row in the second section i get an out of bounds error
//GiftEvent *giftEv=(GiftEvent *)[[fetchedResultsControllerPurchased fetchedObjects]objectAtIndex: indexPath.row];
cell.gift=giftEv;
};
break;
default:
break;
}
}
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete)
{
switch (indexPath.section) {
case WISHLIST_SECTION:
{
// Delete the managed object for the given index path
[self.managedObjectContext deleteObject:[fetchedResultsControllerwish objectAtIndexPath:indexPath]];
// Save the context.
NSError *error;
if (![self.managedObjectContext save:&error]) {
/*
Replace this implementation with code to handle the error appropriately.
abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. If it is not possible to recover from the error, display an alert panel that instructs the user to quit the application by pressing the Home button.
*/
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
[self.tableView reloadData];
};
break;
case PURCHASED_SECTION:
{
// Delete the managed object for the given index path
[self.managedObjectContext deleteObject:[fetchedResultsControllerPurchased objectAtIndexPath:indexPath]];
// Save the context.
NSError *error;
if (![self.managedObjectContext save:&error]) {
/*
Replace this implementation with code to handle the error appropriately.
abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. If it is not possible to recover from the error, display an alert panel that instructs the user to quit the application by pressing the Home button.
*/
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
};
break;
default:
break;
}
}
}
ese es el enfoque exacto que utilicé, pero estoy recibiendo ese error ... – ricastro