Switch another navigation programmatically swift

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)

Rohit · Accepted Answer · 2018-11-23 14:02:37Z

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)
    }

edited Nov 23, 2018 at 14:02

answered Nov 23, 2018 at 13:43

Rohit

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4 Comments

user9018881 Over a year ago

your code not working according to xcode advice, I change your code to question

Rohit Over a year ago

you need to set identifier of your viewController.. check the updated answer just go in your storyboard give the class and storyboard id SecondViewController

user9018881 Over a year ago

Is there a way to do it without messing with storyboard?(Updated question)

Rohit Over a year ago

no you can't :( you need to set it in interface builder

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