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POnumberOfRowsInSection: method for core data and multiple sections
 

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    <p>I am trying to show a table view with 2 sections. The first section will always have 1 row and the second section will have as many rows as data points. I am using Core Data and the following tableView:numberOfRowsInSection: method...</p> <pre><code>- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (section == 0) { return 1; } else { id &lt;NSFetchedResultsSectionInfo&gt; sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section]; return [sectionInfo numberOfObjects]; } } </code></pre> <p>However, I am getting the following error:</p> <blockquote> <p>Terminating app due to uncaught exception 'NSRangeException', reason: '<em>*</em> -[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]'</p> </blockquote> <p>Any help will be appreciated. Thanks.</p> <p>NEW -------------------------------------------------------------------------------</p> <p>This is the current implementation of the relevant methods:</p> <pre><code>- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (section == 0) { return 1; } else { NSUInteger frcSection = section - 1; id &lt;NSFetchedResultsSectionInfo&gt; sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:frcSection]; return [sectionInfo numberOfObjects]; } } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } [self configureCell:cell atIndexPath:indexPath]; return cell; } - (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath { if (indexPath.section == 0) { cell.textLabel.text = entityOne.name; //entityOne object passed from previous VC } else { entityTwo = [self.fetchedResultsController objectAtIndexPath:indexPath]; cell.textLabel.text = entityTwo.name; } } - (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id &lt;NSFetchedResultsSectionInfo&gt;)sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type { NSUInteger frcSectionIndex = 0; frcSectionIndex = sectionIndex + 1; switch(type) { case NSFetchedResultsChangeInsert: [self.tableView insertSections:[NSIndexSet indexSetWithIndex:frcSectionIndex] withRowAnimation:UITableViewRowAnimationFade]; break; case NSFetchedResultsChangeDelete: [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:frcSectionIndex] withRowAnimation:UITableViewRowAnimationFade]; break; } } - (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath { UITableView *tableView = self.tableView; switch(type) { case NSFetchedResultsChangeInsert: [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade]; break; case NSFetchedResultsChangeDelete: [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade]; break; case NSFetchedResultsChangeUpdate: [self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath]; break; case NSFetchedResultsChangeMove: [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade]; [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade]; break; } } </code></pre>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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