Navigation bar disappears when reloading data using UISearchController

Question

My application works so that I have a UISearchController in a reusable view inside a UICollectionViewController. When I click on the search bar, I click any of the results and launches a notification to reload the View collection to reflect the changes.

lazy var searchController: UISearchController = { let tableViewController = UITableViewController(style: .Plain) tableViewController.tableView.dataSource = self tableViewController.tableView.delegate = self tableViewController.tableView.registerClass(StoreListCell.self, forCellReuseIdentifier: "MiniStoreCell") let searchController = UISearchController(searchResultsController: tableViewController) searchController.searchResultsUpdater = self searchController.searchBar.frame = CGRect(x: 0, y: 0, width: CGRectGetWidth(self.collectionView.frame), height: 44) return searchController }() override func viewDidLoad() { super.viewDidLoad() definesPresentationContext = true collectionView.registerClass(UICollectionReusableView.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "SearchView") let layout = collectionView.collectionViewLayout as UICollectionViewFlowLayout layout.headerReferenceSize = CGSize(width: CGRectGetWidth(collectionView.frame), height: 44) token = RLMRealm.defaultRealm().addNotificationBlock({ [unowned self] (notification, realm) -> Void in self.categories = Category.allObjects().sortedResultsUsingProperty("name", ascending: true) self.collectionView.reloadData() }) } override func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView { let searchView = collectionView.dequeueReusableSupplementaryViewOfKind(UICollectionElementKindSectionHeader, withReuseIdentifier: "SearchView", forIndexPath: indexPath) as UICollectionReusableView searchView.addSubview(searchController.searchBar) searchController.searchBar.sizeToFit() return searchView } 

Since reloadData also reloads the reusable view in which the search bar is located, this leads to the disappearance of the navigation bar, leaving me stuck in searchresultsController

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