UISearchBar stays when seguing to another view controller via push

I followed this guide: http://www.jhof.me/simple-uisearchcontroller-implementation/

The only difference in my code is

instead of self.tableView.tableHeaderView = self.searchController.searchBar;

I have self.navigationItem.titleView = self.searchController.searchBar;

When I segue from the results table view controller, the uisearchbar stays in the navigation bar.