7
Mam trudności z wdrażaniem 2 nsfetchedresultsController w tableView. Chciałem fetchedresultsController w każdej sekcji tabeli (2 sekcje), coś takiego:
Wiele NsfetchedResultsController na UItableView
życzeń
- produkt
- produkt2
Kupiony
- product3
wiem, że w tym przykładzie nie musiałaby 2 nsfetchedResultsController ale trzeba to później ..
kiedy usunąć produkt z jednego nsfetchedResultsController to przechodzi do drugiego i ja dostać ten błąd:
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)"
I myśli, że to się dzieje, ponieważ kiedy pierwszy fetchedRController wykryje zmianę aktualizuje tableView przed druga nazywa się tak? powinienem użyć NSMutableArrays i zaktualizować tableView ręcznie?
Kod:
- (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;
}
}
}
To jest dokładne podejście, którego użyłem, ale otrzymuję ten błąd .. – ricastro