Repopulating UITableView after search - ios

Question

I'm using single NSFetchedResultController to populate both self.tableView and UISearchDisplayControler.tableView. After using search bar and dismissing it if I select any row in the self.tableView I get this error:
Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'
I guess that somewhere I miss reloading data but I have no clue where?
Here are some methods which I use for populating both tabble views:
#pragma mark - Table View
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Count sections in FRC
return [[self.groupsFRC sections] count];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Count groups in each section of FRC
return [[[self.groupsFRC sections] objectAtIndex:section] numberOfObjects];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// Get reusable cell
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"GroupCell"];
// If there isn't any create new one
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"GroupCell"];
}
Group *group = [self.groupsFRC objectAtIndexPath:indexPath];
cell.textLabel.text = group.name;
// Checking if group has been selected earlier
if ([self.selectedGroups containsObject:#{#"name" : group.name, #"id" : group.cashID}]) {
[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
} else {
[cell setAccessoryType:UITableViewCellAccessoryNone];
}
return cell;
}
// Adding checkmark to selected cell
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
Group *group = [self.groupsFRC objectAtIndexPath:indexPath];
// Checking if selected cell has accessory view set to checkmark and add group to selected groups array
if (selectedCell.accessoryType == UITableViewCellAccessoryNone)
{
selectedCell.accessoryType = UITableViewCellAccessoryCheckmark;
[self.selectedGroups addObject:#{#"name" : group.name, #"id" : group.cashID}];
NSLog(#"%#", self.selectedGroups);
}
else if (selectedCell.accessoryType == UITableViewCellAccessoryCheckmark)
{
selectedCell.accessoryType = UITableViewCellAccessoryNone;
[self.selectedGroups removeObject:#{#"name" : group.name, #"id" : group.cashID}];
NSLog(#"%#", self.selectedGroups);
}
// Hiding selection with animation for nice and clean effect
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
#pragma mark - Filtering
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:#"SELF.name contains[c] %#", searchText];
self.groupsFRC = [Group MR_fetchAllSortedBy:#"caseInsensitiveName"
ascending:YES
withPredicate:resultPredicate
groupBy:#"sectionLetter"
delegate:self];
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[self filterContentForSearchText:searchString
scope:[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
return YES;
}
-(void)searchDisplayController:(UISearchDisplayController *)controller didHideSearchResultsTableView:(UITableView *)tableView
{
// Setting FRC to fetch original table view data
self.groupsFRC = [Group MR_fetchAllSortedBy:#"caseInsensitiveName"
ascending:YES
withPredicate:nil
groupBy:#"sectionLetter"
delegate:self];
}

Answer 1

Okey, I finally get over this problem but with skipping UISearchDisplayDelegate and implementing this only using UISearchBarDelegate. Here is the code:
-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
if (searchText.length > 0) {
resultPredicate = [NSPredicate predicateWithFormat:#"SELF.name contains[c] %#", searchText];
} else {
resultPredicate = nil;
}
[self refreshFRC];
}
-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
resultPredicate = nil;
[self refreshFRC];
}
- (void)refreshFRC {
if (resultPredicate != nil) {
self.groupsFRC = [Group MR_fetchAllSortedBy:#"caseInsensitiveName"
ascending:YES
withPredicate:resultPredicate
groupBy:#"sectionLetter"
delegate:self];
} else {
self.groupsFRC = [Group MR_fetchAllSortedBy:#"caseInsensitiveName"
ascending:YES
withPredicate:nil
groupBy:#"sectionLetter"
delegate:self];
[self.tableView reloadData];
}
}