Get index of selected row to use in prepare for segue

Question

I want to pass different arrays from one ViewController to another based on which row is selected.
How can I get the index for selected row?
I have tried this, but it does not work:

let toDetailVCSegue = "ToDetailVCSegue"

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        performSegue(withIdentifier: toDetailVCSegue, sender: indexPath)
    }



     func prepare(for segue: UIStoryboardSegue, sender: IndexPath?)
    {
        if segue.identifier == toDetailVCSegue
        {
        let destination = segue.destination as! DetailViewController
            if let indexPath = tableView.indexPathForSelectedRow{
                if indexPath.row == 0 {
                    destination.itemArray = namesArray
                    print("test")
                }
                if indexPath.row == 1 {
                    destination.itemArray = scoresArray
                }
                if indexPath.row == 2 {
                    destination.itemArray = timesArray
                }
                if indexPath.row == 3 {
                    destination.itemArray = completedArray
                }

            }
        }
    } 

Answer 1

You must not change the signature of prepare(for otherwise it's not going to be called. The sender parameter must be Any?

Cast the sender parameter to IndexPath and I recommend a switch statement

func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
    if segue.identifier == toDetailVCSegue {
        let destination = segue.destination as! DetailViewController
        let indexPath = sender as! IndexPath
        switch indexPath.row {
          case 0: destination.itemArray = namesArray
          case 1: destination.itemArray = scoresArray
          case 2: destination.itemArray = timesArray             
          case 3: destination.itemArray = completedArray
          default: break
        }
    }
}