I was using searchbar only instead of search bar and the search display controller which may have caused this issue.
Also done a few changes to the searchdisplay controller implementation below which fixed the issue.
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
[self searchThroughOrders:searchString
scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
objectAtIndex:[self.searchDisplayController.searchBar
selectedScopeButtonIndex]]];
return YES;
}
-(void)searchDisplayController:(UISearchDisplayController *)controller didLoadSearchResultsTableView:(UITableView *)tableView{
[tableView registerClass:[CustomOrdersCell class] forCellReuseIdentifier:@"OrderCell"];
}
-(void)searchThroughOrders:(NSString *)searchText scope:(NSString*)scope {
//getting the text that is entered in the search bar and it creates nspredicated self containes the search and this text will be replaced by search field
NSPredicate *orderResultsPredicate = [NSPredicate predicateWithFormat:@"order_id contains[c] %@", searchText];
//filtering the predicate that is set before
_orderSearchResults = [ordersArray filteredArrayUsingPredicate:orderResultsPredicate];
}