DestinationViewController Segue and UINavigationController using swift - ios

Question

Ive built a side menu that pop out when you click on a bar button item,
After you click on one of the menu options the view controller load up with the right data but the bar button item is disappeared. so i made some research
and i found out that the problem is my segue destination, My segue destination is the view controller and not the navigation controller so i try to change my code ending up with this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let cell = sender as? UITableViewCell{
let i = tableView.indexPath(for: cell)!.row
if segue.identifier == "viewController"{
let nav = segue.destination as! UINavigationController
let addEventViewController = nav.topViewController as! ViewController
addEventViewController.varView = i
}
}
}
And now i'm getting this error:
Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
My storyboard:

Answer 1

Please update your code as below.
Here sharedAppdelegate() is shared instance of appdelegate
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let cell = sender as? UITableViewCell{
let i = tableView.indexPath(for: cell)!.row
if segue.identifier == "viewController"{
let yourDestinationController = segue.destination as! ViewController
let nav = UINavigationController.init(rootViewController: yourDestinationController)
let win = AppDelegate.sharedAppdelegate().window
win.rootViewController = nav
win?.makeKeyAndVisible()
addEventViewController.varView = i
}
}
}
In your Appdelegate add below method
static func sharedAppdelegate() -> AppDelegate
{
return UIApplication.shared.delegate as! AppDelegate
}

Answer 2

I think the problem is that you call segue from your BackTableVC and there is no segue to the navigation controller, only to the controller that is placed bottom right in your storyboard. You either have to perform the segue on RevealViewController or relink the segue so it leads to the navigation controller.