UITableView : crash when adding a section footer view in empty section

Question

This is the first time I ask a question here, but I have to say this site has been a tremendous help for me over the last couple months (iphone-dev-wise), and I thank you fo

Answer 1

it shouldn't be necessary to call both deleteRowsAtIndexPaths:withAnimation: and reloadData on tableView.

the problem you are seeing is the problem i see manifesting in the call to deleteRowsAtIndexPaths:withAnimation:, and thus for you, it's never getting to reloadData anyway.

a simpler solution to having to create new cells, manage them, deal with all of the places where a different cell has to be dealt with, is to use reloadSections:withAnimation: when dealing with a section that is going from 0 to 1 row or 1 to 0 rows.

i.e. replace the following lines of code:

        if(indexPath.section == 0)
        { [firstSectionArray removeObjectAtIndex:indexPath.row]; }
        else 
        { [secondSectionArray removeObjectAtIndex:indexPath.row]; }

        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                         withRowAnimation:UITableViewRowAnimationBottom];

with the following

        BOOL useReloadSection;
        if (indexPath.section == 0)
        {
            [firstSectionArray removeObjectAtIndex:indexPath.row];
            useReloadSection = 0 == firstSectionArray.count;
        }
        else 
        {
            [secondSectionArray removeObjectAtIndex:indexPath.row];
            useReloadSection = 0 == secondSectionArray.count;
        }

        if (useReloadSection)
            [tableView reloadSections:[NSIndexSet indexSetWithIndex:indexPath.section]
                     withRowAnimation:UITableViewRowAnimationBottom];
        else
            [tableView deleteRowsAtIndexPaths:@[indexPath]
                             withRowAnimation:UITableViewRowAnimationBottom];