setting a custom model from a table view controller to a detail view controller

  override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    switch segue.identifier! {
    case "showTodoDetail":
    
      // Get the detail view controller in a local var
      let todoDetailVC = segue.destination as! TodoDetailViewController

      // Get the specific model in a local var
      let cell = sender as! TodoTableViewCell
      
      // Set the model in the detail view controller
      todoDetailVC.todo = cell.todo
    default: break
    }
  }