NSInternalInconsistencyException (invalid number of rows)

Question

Whenever I have data in my UITableView and I start deleting, it works fine. However, when I get to the last object in the table, and delete it, it crashes.

Answer 1

The method tableView:numberOfRowsInSection must always return exact number of rows:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    return [myData count];
}

After having deleted last row, you may want to delete the whole section. Simply call deleteSections:withRowAnimation: within a beginUpdates and endUpdated block;

-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView beginUpdates];
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
        [myData removeObjectAtIndex:[indexPath row]];
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *somepath = [documentsDirectory stringByAppendingPathComponent:@"something.plist"];
        [myData writeToFile:somepath atomically:YES];
        if ([myData count] == 0) {
            // NEW! DELETE SECTION IF NO MORE ROWS!
            [tableView deleteSections:[NSIndexSet indexSetWithIndex:[indexPath section]] withRowAnimation:UITableViewRowAnimationFade];
        }
        [tableView endUpdates];
    }   
}