cscouto

class ViewController: UIViewController {
    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var heightTableView: NSLayoutConstraint!
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        tableView.addObserver(self, 
                              forKeyPath: "contentSize", 
                              options: .new, 
                              context: nil)