Data to separate view controller not working

Question

So I'm trying to pass data from a cell to a different view controller, and while I do get back the value inside "user3" when I try to transport it over to "user2" I don't get any value. I have tried to print user2 and didn't get back anything and neither any errors. I'm suspecting it has something to do with the "func prepare" but I can't figure out what.

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
    return posts.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
    let cell = tableView.dequeueReusableCell(withIdentifier:"searchCell", for: indexPath)
    as! CustomTableViewCell
    cell.titleField?.text = posts[indexPath.row].caption
    cell.userUID?.text = posts[indexPath.row].uid
    cell.descriptionField?.text = posts[indexPath.row].description
    cell.tagsField?.text = posts[indexPath.row].tags
    let photoUrl = posts[indexPath.row].photoUrl
    let url = URL(string: photoUrl)
    cell.SearchImage.sd_setImage(with: url, placeholderImage: nil)
    return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let indexPath = tableView.indexPathForSelectedRow
    let currentCell = tableView.cellForRow(at: indexPath!)! as! CustomTableViewCell
    let currentItem = currentCell.userUID!.text
    var user3: String = ""
    user3.append(currentItem!)



func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let destinationViewController = segue.destination as? userViewController {
            destinationViewController.user2 = user3
        }
    }

}

Answer 1

I recommend to forget didSelectRowAt and connect the segue to the prototype cell in Interface Builder rather than to the view controller.

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let indexPath = tableView.indexPathForSelectedRow
    let currentCell = tableView.cellForRow(at: indexPath!)! as! CustomTableViewCell
    let currentItem = currentCell.userUID!.text
    var user3: String = ""
    user3.append(currentItem!)
}

Then prepare(for segue is called passing the table view cell in the sender parameter

func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let destinationViewController = segue.destination as? userViewController,
            let cell = sender as? CustomTableViewCell,
            let indexPath =  tableView.indexPath(for: cell) {
               let currentUID = posts[indexPath.row].uid
               destinationViewController.user2 = currentUID
        }
    }
}

Get always the data from the model (the data source array), not from the view (the cell)