Reloading UITableView behind UISearchDisplayController

Question

I\'ve run into this really strange phenomenon that I can\'t quite figure out. I have a UITableViewController that manages a UITableView. Pretty simple. I also have a UISearch

Answer 1

UPDATED AGAIN

As it turns out, if a table's header is reloaded in the background it pops in front of the search controller no matter what.

I solved this by disabling the fetchedResultsController (setting it to nil) and letting it load lazily again when needed when the search disappears.

UPDATED - Original answer below

In my case I'm using two fetchedResultsControllers one for the main tableview and one for the search.

I discovered that preventing animations when adding the section headers prevents this bug. So while searchDisplayController.active I simply disable the animation of the section change. see code below.

- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id )sectionInfo
           atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
{
    if (!self.reordering) {
        UITableView *myTableView = controller == __fetchedResultsController ? self.tableView : self.searchDisplayController.searchResultsTableView;
        UITableViewRowAnimation animation;
        if (self.searchDisplayController.active) {
            animation = UITableViewRowAnimationNone;
        } else {
            animation = UITableViewRowAnimationFade;
        }

        switch(type)
        {
            case NSFetchedResultsChangeInsert:
                [myTableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:animation];
                break;

            case NSFetchedResultsChangeDelete:
                [myTableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:animation];
                break;
        }
    }
}

ORIGINAL ANSWER

The other answer doesn't actually work on it's own. The reason is, the header that is showing is not a header in the searchDisplayController's tableview. It's a header from the main tableview that for some reason is being added above the search table view in the view hierarchy.

I solved this problem by disabling updates to the main tableview while searchDisplayController.active = YES.

In my case I'm using a lazily loaded fetched results controller so I did it like this:

- (void)searchDisplayController:(UISearchDisplayController *)controller didHideSearchResultsTableView:(UITableView *)tableView {
    [self.tableView reloadData];
}

- (void)searchDisplayController:(UISearchDisplayController *)controller willShowSearchResultsTableView:(UITableView *)tableView {
    self.fetchedResultsController.delegate = nil;
    self.fetchedResultsController = nil;
}

However, I still have the problem that if I want to reloadData on the main tableview so it is seen in the background, the section headers still float in front of the darkened area.

Does anyone have a better solution for this? It seems like a legitimate bug for viewForHeaderInSection and titleForHeaderInSection when data is reloaded while covered by a UISearchDisplayController.

The simplest answer for me is to try and override the search view so you can't see the background table. But that takes away from the "Appleness" of the app.