how to update information in a Table View when user starts typing in the search bar - swift

Question

I am trying to automatically reload a list when the user types into the search bar of a TableView.
I have attempted to do this using my following code. I am able to get the list but even if I type into the search bar, it doesn't "filter" the results.
class UsersTableViewController: UITableViewController, UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
//update the search results
filterContent(searchText: self.searchController.searchBar.text!)
}
#IBOutlet var usersTableView: UITableView!
let searchController = UISearchController(searchResultsController: nil)
var usersArray = [NSDictionary?]()
var filteredUsers = [NSDictionary?]()
var databaseRef: DatabaseReference!
override func viewDidLoad() {
super.viewDidLoad()
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
definesPresentationContext = true
tableView.tableHeaderView = searchController.searchBar
databaseRef = Database.database().reference()
let usersRef = databaseRef.child("users")
let query = usersRef.queryOrdered(byChild: "email")
query.observe(.childAdded, with: {(snapshot) in
self.usersArray.append((snapshot.value as? NSDictionary?)!)
//insert the rows
self.usersTableView.insertRows(at: [IndexPath(row:self.usersArray.count-1, section: 0)], with: UITableView.RowAnimation.automatic)
}) { (error) in
print(error.localizedDescription)
}
print("HOLAAAAAAAAAAA")
print(self.usersArray)
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
if ((searchController.isActive) && (searchController.searchBar.text != "")){
return filteredUsers.count
}
return self.usersArray.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
let user: NSDictionary
if ((searchController.isActive) && (searchController.searchBar.text != "")){
user = filteredUsers[indexPath.row]!
}else{
user = self.usersArray[indexPath.row]!
}
cell.textLabel?.text = user["email"] as? String
cell.detailTextLabel?.text = user["name"] as? String
return cell
}
func filterContent(searchText: String){
self.filteredUsers = self.usersArray.filter({ user in
let userEmail = user!["email"] as? String
return (userEmail != nil)
})
tableView.reloadData()
}
}
What I expect to get isle verytime that the user starts typing, the list should be displaying only the searches that match the string from the search bar. But it is not doing it.