swift search Bar and navigation bar will be hidden after starting - ios

Question

in my swift 2 app i have a table view with a search bar:
But if tap on the search bar, my navigation bar and the search bar will be hidden.
This is my code which is in the viewDidLoad
self.resultSearchController = ({
let controller = UISearchController(searchResultsController: nil)
controller.searchResultsUpdater = self
controller.dimsBackgroundDuringPresentation = false
controller.searchBar.sizeToFit()
controller.hidesNavigationBarDuringPresentation = true
self.MyTable.tableHeaderView = controller.searchBar
return controller
})()
At the beginning i also get this message:
Attempting to load the view of a view controller while it is
deallocating is not allowed and may result in undefined behavior
()
My Question is, where is my mistake? :/

Answer 1

from this tutorial you can use this code to solve the problem.
self.navigationController!.navigationBar.translucent = false
searchController!.hidesNavigationBarDuringPresentation = false
// This makes the view area include the nav bar even though it is opaque.
// Adjust the view placement down.
self.extendedLayoutIncludesOpaqueBars = true
self.edgesForExtendedLayout = UIRectEdge.Top

Answer 2

You have to modify your code with the below if you want to make it worked perfectly:
self.resultSearchController = UISearchController(searchResultsController: nil)
self.resultSearchController.searchResultsUpdater = self
self.resultSearchController.searchBar.delegate = self
self.definesPresentationContext = true
self.resultSearchController.dimsBackgroundDuringPresentation = false
self.resultSearchController.hidesNavigationBarDuringPresentation = true
if #available(iOS 11.0, *) {
self.navigationItem.searchController = self.resultSearchController
} else {
self.tableView.tableHeaderView = self.resultSearchController.searchBar
}