userId coming to appdelegate still not going to Mainviewcontroller why? in swift

Question

NavigationController is isinitial viewcontroller in storyboard, NavigationController embedded to LoginViewcontroller

in project storyboard navigation willbe like below

NavigationController->LoginViewcontroller-> RegistrationViewcontroller -> MainViewcontroller

in successful registration with PhNUmber i am getting userId which i have stored in KeychainWrapper

in RegistrationViewcontroller: i am storing userId like below:

 let userID: String=jsonObj?["userId"] as? String ?? "" 
 KeychainWrapper.standard.set(userID, forKey: "USERID")

which i am checking in appdelegate like below to go Mainviewcontroller:

class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?
var savedUserId: String?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    savedUserId = KeychainWrapper.standard.string(forKey: "USERID")
    print("appdelegate userid \(savedUserId)")
    if savedUserId != nil{
        print("saveuserid \(savedUserId)")
        let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
        window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")
    }
    return true
}
}

here savedUserId coming then why i am not going to MainViewcontroller, all the time LoginViewcontroller appears

Frankenstein · Accepted Answer · 2020-06-05T12:06:51.040

1

You need to initialize the window. Give this line above setting the rootViewController:

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var savedUserId: String?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        savedUserId = KeychainWrapper.standard.string(forKey: "USERID")
        print("appdelegate userid \(savedUserId)")
        if savedUserId != nil{
            print("saveuserid \(savedUserId)")
            let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
            window = UIWindow()
            window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")
        }
        return true
    }
}

Update: If you're using SceneDelegate you should use this:

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = scene as? UIWindowScene else { return }
        window = UIWindow(windowScene: windowScene)print("appdelegate userid \(savedUserId)")
        if savedUserId != nil{
            print("saveuserid \(savedUserId)")
            let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
            window = UIWindow()
            window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")
        }
    }
}

edited Jun 05 '20 at 12:06

answered Jun 05 '20 at 11:03

Frankenstein

15,732
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if i give like this `var window = UIWindow()` then error: Type of 'window' has different optionality than required by protocol 'UIApplicationDelegate' – Swift Jun 05 '20 at 11:32
var window: UIWindow? and in `didFinishLaunchingWithOptions` in window = UIWindow() window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")............then also login viewcontroller appears – Swift Jun 05 '20 at 11:35
I doubt If you're providing your answer as I expect. So I've updated my answer to the entire code that you've provided. – Frankenstein Jun 05 '20 at 11:46
both userid coming appdelegate userid Optional("415c6073d45a481f991cb81b4c81bf81") saveuserid Optional("415c6073d45a481f991cb81b4c81bf81"). but loginviewcontroller coming – Swift Jun 05 '20 at 11:53
Could you check if `mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController") != nil` is getting `true`. – Frankenstein Jun 05 '20 at 11:54
@iOSApp If you're using SceneDelegate you should be using the update I've just posted. – Frankenstein Jun 05 '20 at 12:07
SceneDelegate file is there but i am not using.. i am using appdelegate only – Swift Jun 05 '20 at 12:17
That doesn't count. If you're not using SceneDelegate then delete it and remove its reference from `info.plist`. – Frankenstein Jun 05 '20 at 12:19
oh yeah I have deleted both SceneDelegate file and its reference then its working.. thanks for that information – Swift Jun 06 '20 at 09:41
if there is a chance pls suggest me here https://stackoverflow.com/questions/63406320/how-to-stop-autofilling-address-in-textfields-in-swift – Swift Aug 14 '20 at 07:40

score 1 · Answer 2 · answered Jun 05 '20 at 11:08

Try using this extension

  // add this function in your AppDelegate

  func makeRootVC(_ storyBoardName : String, _ vcName : String) {
        let vc = UIStoryboard(name: storyBoardName, bundle: Bundle.main).instantiateViewController(withIdentifier: vcName)
        let nav = UINavigationController(rootViewController: vc)
        nav.navigationBar.isHidden = true
        self.window?.rootViewController = nav
        let options: UIView.AnimationOptions = .transitionCrossDissolve
        let duration: TimeInterval = 0.6
        UIView.transition(with: self.window!, duration: duration, options: options, animations: {}, completion: nil)
    }

then use it like this in your didFinishLaunchingWithOptions

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    savedUserId = KeychainWrapper.standard.string(forKey: "USERID")
    print("appdelegate userid \(savedUserId)")
    if savedUserId != nil{
        print("saveuserid \(savedUserId)")
        self.makeRootVC("Main","MainViewController")
    }
    return true
}

UIView.transition(with: self.window!, duration: duration, options: options, animations: {}, completion: nil). error: Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value — Swift, Jun 05 '20 at 11:14
@iOSApp Refer this for setting rootViewController from sceneDelegate https://stackoverflow.com/questions/58188296/how-set-rootviewcontroller-in-scene-delegate-ios-13 — Keshu R., Jun 05 '20 at 11:50

score 1 · Answer 3 · answered Jun 05 '20 at 13:06

1

check if window is nil and add makeKeyAndVisible() after setting rootViewController in AppDelegate

if(window == nil){
    self.window = UIWindow(frame:UIScreen.main.bounds)
}
if savedUserId != nil{
    print("saveuserid \(savedUserId)")
    let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
    window?.rootViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainViewController")
    self.window?.makeKeyAndVisible()
}

answered Jun 05 '20 at 13:06

SM Abu Taher Asif

2,221
1
12
14

if i print userid in `if(window == nil){` both prints but not going to mainviewcontroller – Swift Jun 05 '20 at 13:15

userId coming to appdelegate still not going to Mainviewcontroller why? in swift

3 Answers3