如何在不使用segue的情况下将一些值从一个视图控制器传递给Swift 4中的UINavigationController？

Question

I want to pass value from one UIviewController to UINavigationViewController without using segue in swift 4.

My sample code is following

let vc = storyboard?.instantiateViewController(withIdentifier: "MainMenuId") as! UINavigationViewController
vc.sendValue = String    //String send to sendValue which present in UINavigationController           
self.present(vc!, animated: true, completion: nil)

But when I try to send at at that time my app is crashed and get error

Could not cast value of type 'UINavigationController' to 'UIViewController'

So How do I pass value from above structure without using segue. Thx in advance ;)

Answer 1

You can use below code:

let vc = storyboard?.instantiateViewController(withIdentifier:"MainMenuId") as! UIViewController
let nav = UINavigationController(rootViewController: vc)

vc.sendValue = String              
self.present(nav!, animated: true, completion: nil)