Switch another navigation programmatically swift - ios

Question

I ignore storyboard and create UINavigationController in AppDelegate.swift
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
window = UIWindow(frame: UIScreen.main.bounds)
window?.makeKeyAndVisible()
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
window?.rootViewController = UINavigationController(rootViewController: HomeController(collectionViewLayout: layout))//make the ViewController class to be the root
return true
}
I have leftBarButton which switches to another UINavigationController or UICollectionViewController(according to your advice)
override func viewDidLoad() {
super.viewDidLoad()
let parentMenuButton = UIButton(frame: CGRect(x: 0, y: 0, width: 34, height: 34))
parentMenuButton.addTarget(self, action: #selector(self.menuButtonOnClicked), for: .touchUpInside)
navigationItem.leftBarButtonItem = UIBarButtonItem(customView: parentMenuButton)
}
#objc func menuButtonOnClicked(){
print("menuButtonOnClicked button is pressed")
}
How can I achieve this programmatically?(switch another navigation area by pressing menu button)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let secondViewController = storyboard.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController
self.navigationController!.pushViewController(secondViewController, animated: true)
Error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Storyboard () doesn't contain a view controller with identifier 'SecondViewController''
I create SecondViewController:
import UIKit
class SecondViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
}
Is there a way to do it without messing with storyboard?(only programatically)

Answer 1

You need to call push method in your menuButtonOnClicked()
#objc func menuButtonOnClicked(){
print("menuButtonOnClicked button is pressed")
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let secondViewController = storyboard.instantiateViewControllerWithIdentifier("SecondViewController") as SecondViewController
self.navigationController.pushViewController(secondViewController, animated: true)
}