Get custom NavigationController class from custom UIViewController - ios

Question

I am trying to implement the side navigation menu (one that we have in Android) in iOS App.So far i tried the following:-
AppDelegate.swift :-
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var bridge: RCTBridge!
func application(_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions:
[UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let sb = UIStoryboard(name: "mystoryboard", bundle: Bundle.main)
let rootViewController: UIViewController =
sb.instantiateViewController(withIdentifier:
"NativeLabelSwiftViewController") as UIViewController
let navigationController = UINavigationController(rootViewController:
rootViewController)
window = UIWindow(frame: UIScreen.main.bounds)
window!.rootViewController = navigationController
window!.makeKeyAndVisible()
return true
}
The above is my AppDelegate class since it is a React Native project we have the generated code as well.Here added the following code to instantiate my rootViewClass(NativeLabelSwift) by following code :-
let sb = UIStoryboard(name: "mystoryboard", bundle: Bundle.main)
let rootViewController: UIViewController =
sb.instantiateViewController(withIdentifier:
"NativeLabelSwiftViewController") as UIViewController
NavigationLabelSwiftViewController.swift(Custom View Class) :-
class NativeLabelSwiftViewController: UIViewController{
var bridge: RCTBridge!
override func viewDidLoad() {
super.viewDidLoad()
title = "Production Tracking"
let btn2 = UIButton(type: .custom)
btn2.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
btn2.addTarget(self,
action:#selector(NativeLabelSwiftViewController.
onBtn2Clicked.(_:)), for: .touchUpInside)
let item2 = UIBarButtonItem(customView: btn2)
self.navigationItem.setLeftBarButton(item2, animated: true)
}
#IBAction func onBtn2Clicked(_ sender: UIBarButtonItem) {
if let navViewController = self.navigationController as?
NavigationController {
// navigation view controller is available
}
else{
// navigation view controller not available
}
}
}
The Navigation Controller has a UIViewController class (NativeLabelSwiftViewController) that has a button in Tab Bar.On Press of the Button i need to access the Navigation Controller method.But i am not able to get the navigation controller using the below code :-
let navViewController = self.navigationController as?
NavigationController; //this is NIL
But
let uiViewController = self.navigationController as?
UINavigationController; //this is not NIL

Answer 1

You are not referring your custom navigation controller in the AppDelegate. You used UINavigationController(rootViewController: rootViewController).
You if you want to use the storyBoard NavigationController, In AppDelegate use -
let nav = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "NavigationController") as! NavigationController
window = UIWindow(frame: UIScreen.main.bounds)
window!.rootViewController = nav
window!.makeKeyAndVisible()
return true
Note: Don't forget to put an Identifier for the StoryBoard NavigationController.