Could not cast value of type to UINavigationController swift3

I'm getting the following cast error (when I click on the "+" button in the simulator [NavigationController]) and can't figure out why.
I'm using Swift3. Thanks for your help!

MainVC.swift

protocol AddTaskDelegate: class
func saveTask(by controller: AddVC, with data: [String:String])



class MainVC: UIViewController
// all tasks from the database
var tasks = [ToDoListTasks]()

@IBOutlet weak var table: UITableView!

// connect with Core Data
let managedObjectContext = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
...

// prepare segue to send data
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
if segue.identifier == "AddSegue"
let navigationController = segue.destination as! UINavigationController
let childViewController = navigationController.topViewController as! AddVC

childViewController.delegate = self as! AddTaskDelegate





AddVC.swift

class AddVC: UIViewController {

weak var delegate: AddTaskDelegate?
...


1 Answer
1

Just read the error message. You are saying

segue.destination as! UINavigationController


But the destination of this segue is not a UINavigationController.

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