title: searchview returns blank when I search
body: <p>I am new to Xcode and Swift but the understanding is coming. The problem right now is that I have a table view with a searchview in it. When I run the code, data is received from the api to the tableview correctly but when I try to make a search then its returns an empty list.</p>
  
  <p>How can I correct my code?</p>
  
  <p>My Controller:</p>
  
  <pre><code> var clientDetails = [Client]()
  var currentClientDetails = [Client]()
  
  func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -&gt; Int {
      return currentClientDetails.count
  }
  
  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -&gt; UITableViewCell {
      guard let cell = tableView.dequeueReusableCell(withIdentifier: "clients_list") as? ClientCellTableViewCell else { return UITableViewCell() }
  
      cell.nameLb.text = "Name: " + currentClientDetails[indexPath.row].CLNT_FULLNAME
      cell.emailLb.text = "Email: " + currentClientDetails[indexPath.row].CLNT_EMAIL
      cell.phonenumberLb.text = "Phone Number: " + currentClientDetails[indexPath.row].CLNT_PHONE
      cell.clientidLb.text = "ID: " + currentClientDetails[indexPath.row].CLNT_CODE
      return cell
  }
  
  override func viewDidLoad() {
      super.viewDidLoad()
  
      self.clientsTableView.delegate = self
      self.clientsTableView.dataSource = self
  
      fetchData()
      setUpSearchBar()
      alterLayout()
  }
  
  func alterLayout() {
      clientsTableView.tableHeaderView = UIView()
      // search bar in section header
      clientsTableView.estimatedSectionHeaderHeight = 50
      // search bar in navigation bar
      //navigationItem.leftBarButtonItem = UIBarButtonItem(customView: searchBar)
      navigationItem.titleView = searchBar
      searchBar.showsScopeBar = false // you can show/hide this dependant on your layout
      searchBar.placeholder = "Search Client by Name"
  }
  
  private func setUpSearchBar() {
      searchBar.delegate = self
  }
  
  func fetchData(){
  
      let myapiurl = URL(string: "https://fpay.com/api")
  
      guard let downloadURL = myapiurl else { return }
      URLSession.shared.dataTask(with: downloadURL) { data, urlResponse, error in
          guard let data = data, error == nil, urlResponse != nil else {
              DispatchQueue.main.async {
                  let alert = UIAlertController(title: "Fofoofo Pay", message: "Please try again or check your internet connection", preferredStyle: .alert)
                  let action = UIAlertAction(title: "Ok", style: .default, handler: nil)
                  alert.addAction(action)
  
                  self.present(alert, animated: true, completion: nil)
              }
              return
          }
          print("JSON downloaded")
          do
          {
              let decoder = JSONDecoder()
              let downloadedJson = try decoder.decode(Client_details.self, from: data)
              self.clientDetails = downloadedJson.client_details
              self.currentClientDetails = self.clientDetails
              DispatchQueue.main.async {
                  self.clientsTableView.reloadData()
              }
          } catch {
              print(error)
          }
      }.resume()
  }
  
    // Search Bar
      func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
          currentClientDetails = clientDetails.filter({ client -&gt; Bool in
              switch searchBar.selectedScopeButtonIndex {
              case 0:
                  if searchText.isEmpty { return true }
                  return client.CLNT_FULLNAME.lowercased().contains(searchText.lowercased())
              default:
                  return false
              }
          })
          clientsTableView.reloadData()
      }
  </code></pre>
  
  <p>Client class:</p>
  
  <pre><code>    Client_details: Codable {
      let client_details: [Client]
  
      init(client_details: [Client]) {
          self.client_details = client_details
      }
  }
  
  class Client:Codable {
      let CLNT_CODE:String
      let CLNT_FULLNAME:String
      let CLNT_PHONE:String
      let CLNT_EMAIL:String
      init(CLNT_CODE:String, CLNT_FULLNAME:String, CLNT_PHONE:String, CLNT_EMAIL:String) {
          self.CLNT_CODE = CLNT_CODE
          self.CLNT_FULLNAME = CLNT_FULLNAME
          self.CLNT_PHONE = CLNT_PHONE
          self.CLNT_EMAIL = CLNT_EMAIL
      }
  </code></pre>