App Delegate crashes with NSException when trying to change root view controller

Question

Trying to change the root view controller after the first time running the app but it crashes.

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        if(UserDefaults.standard.bool(forKey: "notFirstInApp") == false){
            UserDefaults.standard.set(true, forKey: "notFirstInApp")
            let state = StateTableViewController()
            window?.rootViewController = state
        }else{
            let home = HomeViewController()
            window?.rootViewController = home
        }

        return true
    }

Crashes with

libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

Thanks in advance.

This is not the right way of initializing ViewController. Please refer to this answer for details https://stackoverflow.com/a/30592893/5949670 — Roohul, Jul 19 '19 at 03:25

score 0 · Accepted Answer · answered Jul 19 '19 at 03:12

You can not directly set rootViewController by viewController name. Please check below code

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewController = storyboard.instantiateViewController(withIdentifier: "LoginSignupVC")
self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()

App Delegate crashes with NSException when trying to change root view controller

1 Answers1