How to Use Querystartingatvalue in My Searchcontroller to Search for Users

How can I use queryStartingAtValue in my searchcontroller to search for users?

The code in the question is almost correct, just need to tweak it to ensure the enumeration var is a snapshot and then use it with Mapper.

As a user enters a user name, recursively call this with each keypress; so if they are typing in Leroy, L is typed first and this code will retrieve all nodes where the username value starts with "L". Then the user types 'e' making it 'Le' etc etc.

func searchUsers(text: String) {
    if text.count > 0 {
       self.usersArray = [] //clear the array each time
       let endingText = text + "\u{f8ff}"
       databaseRef.child("profile").queryOrdered(byChild: "username")
                                   .queryStarting(atValue: text)
                                   .queryEnding(atValue: endingText)
                                   .observeSingleEvent(of: .value, with: { snapshot in

           for child in snapshot.children {
               let childSnap = child as! DataSnapshot
               let userObj =  Mapper<UserModel>().map(JSONObject: childSnap.value!)
               userObj?.uid = childSnap.key
               if childSnap.key != self.loggedInUser?.uid { //ignore this user
                  self.usersArray.append(userObj!)
               }
           }
           self.tableView.reloadData()
       })
    }
  } //may need an else statement here to clear the array when there is no text

EDIT:

OP requested code for handling the search through a searchBar and a if statement to prevent searching if there are is no text. Here's the delegate method for that which calls the searchUsers function above

func searchBar(_ searchBar: UISearchBar,
               textDidChange searchText: String) {

    self.searchUsers(text: searchText)
}

EDIT:

OP wanted to see my viewDidLoad function, as unexciting as it is, so here it is.

class ViewController: UIViewController, UISearchBarDelegate 
    override func viewDidLoad() {
       super.viewDidLoad()

       // Do any additional setup after loading the view.
    }

Why dosent my tableview show search results?

You have 2 arrays usersArray and filteredUsers

if childSnap.key != self.loggedInUser?.uid { //ignore this user
       self.usersArray.append(userObj!)
}
...
 self.tableView.reloadData()

so the the above reload has no effect as you always use

let user = filteredUsers[indexPath.row]

in cellForRowAt , in such cases you should have a var like

var isSearching = false

and alter it when you search then in all delegate & dataSource methods

 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return isSearching ? filteredUsers.count : usersArray.count
 }
 func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! FollowTableViewCell

    let user = isSearching ? filteredUsers[indexPath.row] : usersArray[indexPath.row] 
  .....
 }

func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
    isSearching = true
}

func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
    isSearching = false
}

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    isSearching = false
}

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    isSearching = false
}

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {

    filteredUsers = usersArray.filter { /* do filter */ }

    if(filteredUsers.count == 0){
        isSearching = false
    } else {
        isSearching = true
    }
    self.tableView.reloadData()
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    self.performSegue(withIdentifier: "user", sender: isSearching ? self.filteredUsers[indexPath.row] : self.usersArray[indexPath.row])
}

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