title: JSON response not being shown inside the cell
body: <p>I’m creating a Tableview and trying to include in the cell one information that I receive through a JSON from an API. 
  The information (JSON) is being received very well and recorded correctly inside the variable. 
  However, what I could find is that as the information is received with a small “delay” is not being set as the cell’s label text at the cell creation moment, which is being set with the default variable content. 
  I guess the solution would be to update the label at the moment I parse the JSON content, right? How do I do this? (Update a cell’s label after it is already created) 
  Any other insight/ solution is greatly appreciated. </p>
  
  <pre><code>class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, AddStock {
  
      let operacoesAcoes = ListaOperacoes()
      var todasAsOperacoes : [Operacao] = []
  
      @IBOutlet weak var acoesTableView: UITableView!
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
          acoesTableView.delegate = self
          acoesTableView.dataSource = self
          acoesTableView.register(UINib(nibName: "StandardStockListCell", bundle: nil), forCellReuseIdentifier: "standardCell")
          operacoesAcoes.consolidaAcoes()
      }
  
      func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -&gt; Int {
          return operacoesAcoes.carteiraAcoes.count
      }
  
      func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -&gt; UITableViewCell {
          let cell = tableView.dequeueReusableCell(withIdentifier: "standardCell", for: indexPath) as! StandardStockListCell
          let informacaoCompletaAcao = operacoesAcoes.carteiraAcoes[indexPath.row]
  
          cell.codigoTextField.text = informacaoCompletaAcao.codigoAcao
          cell.nomeTextField.text = informacaoCompletaAcao.nomeAcao
          cell.quantidadeTotal.text = String(informacaoCompletaAcao.quantidadeTotal)
          cell.precoMedioLabel.text = String(format: "%.2f", informacaoCompletaAcao.precoMedio)
  
         // 
         // This is the part of the code that should set one label with a value returned from "buscaCotacao" but it does not work
         // because at the time the cell is displayed it is still not updated from JSON information:
         // Note: the buscaCotacao func is working fine 
  
          cell.precoAtualLabel.text = buscaCotacao(ativo: informacaoCompletaAcao.codigoAcao)
  
          return cell
      }
  </code></pre>