How to navigate UITabBarController to ViewController?

Question

I have a TabBarController inside I am loading two ViewControllers.

import UIKit

class TabBarViewController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

    }
}

Images:

class AttendanceViewController: UIViewController,UIApplicationDelegate,
    UICollectionViewDelegateFlowLayout,UINavigationControllerDelegate,
    CLLocationManagerDelegate,UIImagePickerControllerDelegate {

    override func viewWillAppear(_ animated: Bool) {
    if  Auth.auth().currentUser?.uid == nil {
        //Below code is not working
        let vc = UIStoryboard.init(name: "Main", bundle: Bundle.main)
        .instantiateViewController(withIdentifier: "LoginViewController") as? LoginViewController
        self.navigationController?.pushViewController(vc!, animated: true)
        print("user is not login in redirect to login page")
        return
    }else{
        print("User Successfully loginedin")
    }
}

}

Note : I have two view controller like AttendanceViewController and TaskViewController I want to check if user is not login then I want to redirect to my LoginViewController I tried above code it's was not working

@wings yes bro...`AttendanceViewController` I am cheking if your is not login redirect to `loginViewController` but its not working..it's coming inside `if` loop but `LoginViewController` is not displaying.. — Gowthaman M, Nov 27 '18 at 09:23
make sure your `AttendanceViewController ` is wrapped into a `UINavigationController`. — Torongo, Nov 27 '18 at 09:26
@Torongo After adding `UINavigationController` now it working bro..but it's overlapping means loginviewController showing ontop of the TabBarviewController — Gowthaman M, Nov 27 '18 at 09:33
LoginViewController is inside the tabBar? I suggest that if the user is not logged in instead of pushing the LoginViewController set it as root view, doing that the view flow will start from the loginViewContoller. — FedeH, Nov 27 '18 at 09:33
@FedeHenze no sir....Inside TabBar I have **Attendance** and **Task** Viewcontroller....`LoginViewController` is separate — Gowthaman M, Nov 27 '18 at 09:35
@GowthamanM if LoginVC is not in the TabBarController setting it as a root view controller should work. — FedeH, Nov 27 '18 at 09:40
@RobertDresler I am new to iOS I am not getting what you are asking..still I created one ViewController from storyboard then I linked my LoginViewControlller. — Gowthaman M, Nov 27 '18 at 09:42
@RobertDresler ya sure give me sometime will check and let u know..Thanks bro — Gowthaman M, Nov 27 '18 at 09:45
move your login checking code to `TabBarViewController`, and assign `LoginViewController ` to rootWindow (instead of pushing it) — SPatel, Nov 27 '18 at 10:03

Robert Dresler · Answer 1 · 2018-11-27T10:08:57.520

1

Present UIViewController

Code you wrote would work if your ViewControllers were embed in UINavigationController, which they're not. So instead of pushing UIViewController from UINavigationController which doesn't exist you can just present your LoginViewController. So replace this:

let vc = UIStoryboard.init(name: "Main", bundle: Bundle.main)
.instantiateViewController(withIdentifier: "LoginViewController") as? LoginViewController
self.navigationController?.pushViewController(vc!, animated: true)

with

let vc = UIStoryboard.init(name: "Main", bundle: Bundle.main)
.instantiateViewController(withIdentifier: "LoginViewController") as? LoginViewController
present(vc!, animated: true, completion: nil)

Embed in UINavigationController

Alternatively you can embed your UIViewController in UINavigationController and set segue with identifier and then perform this segue to LoginViewController.

7. Perform segue

performSegue(withIdentifier: "YourIdentifier", sender: self)

edited Nov 27 '18 at 10:08

answered Nov 27 '18 at 09:26

Robert Dresler

10,580
2
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nside TabBar I have Attendance and TaskViewcontroller....LoginViewController is separate – Gowthaman M Nov 27 '18 at 09:35
it's working but my LoginVIewController is not showing the My UI Design sir – Gowthaman M Nov 27 '18 at 09:57
1

but this is not problem of this code. Maybe some mistake in LoginViewController? – Robert Dresler Nov 27 '18 at 10:01
@GowthamanM btw, you can try alternative way (edited answer). – Robert Dresler Nov 27 '18 at 10:05
Thank you sir..will check it – Gowthaman M Nov 27 '18 at 10:05

score 1 · Accepted Answer · answered Nov 27 '18 at 15:33

Hey I just created an example it will help you:-

I just use userdefaults to save loginState

Here is:-

1). TaskViewController

I just created a signOut button in it

import UIKit

class TaskViewController: UIViewController {


@IBOutlet weak var signOutButton: UIButton!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func viewDidLayoutSubviews() {
    signOutButton.layer.cornerRadius = signOutButton.layer.frame.height/2
}



@IBAction func signOutButtonTapped(_ sender: Any) {

    UserDefaults.standard.set(false, forKey: "isUserLoggedIn")  // here I remove the boolean value
    UserDefaults.standard.synchronize()
    let storyBoard = UIStoryboard(name: "Login", bundle: nil)
    let loginVc = storyBoard.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
    let rootVc = UINavigationController(rootViewController: loginVc)
    UIApplication.shared.keyWindow?.rootViewController = rootVc

}



}

2). AttendanceViewController - I didn't created anything in it

import UIKit

class AttendanceViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}


}

These both controllers are inside TabBarController which is HomeController

import UIKit

class HomeController: UITabBarController {

override func viewDidLoad() {
    super.viewDidLoad()


}

}

I created it in Main.storyboard file:-

And LoginViewController created in login.storyboard file

LoginViewController:- here saved the loginState

import UIKit

class LoginViewController: UIViewController {

@IBOutlet weak var loginButton: UIButton!


override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func viewDidLayoutSubviews() {
    loginButton.layer.cornerRadius = loginButton.layer.frame.height/2
}


@IBAction func loginButtonTapped(_ sender: Any) {

    let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    let viewController = mainStoryboard.instantiateViewController(withIdentifier: "HomeController") as! HomeController
    UserDefaults.standard.set(true, forKey: "isUserLoggedIn")
    UserDefaults.standard.synchronize()
    UIApplication.shared.keyWindow?.rootViewController = viewController

}

}

And last in Appdelegate.swift check the loginState in didFinishLaunchingWithOptions like this:-

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

    let userLoginStatus = UserDefaults.standard.bool(forKey: "isUserLoggedIn")
    print(userLoginStatus)

    if(userLoginStatus)
    {
        let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
        let centerVC = mainStoryBoard.instantiateViewController(withIdentifier: "HomeController") as! HomeController
        window!.rootViewController = centerVC
        window!.makeKeyAndVisible()
    } else {

        let mainStoryBoard = UIStoryboard(name: "Login", bundle: nil)
        let centerVC = mainStoryBoard.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
        window!.rootViewController = centerVC
        window!.makeKeyAndVisible()
    }

    return true
}

Here is the full project - https://www.dropbox.com/s/3d34raovyx6orda/saveLogin.zip?dl=0

what do you want to achieve on that question?... I didn't understand — Wings, Nov 28 '18 at 11:44
Are you practising this code if then share it on GitHub or dropbox :D — Wings, Nov 28 '18 at 12:08
hi bro....can you pleas help me refer this link. https://stackoverflow.com/questions/53810969/how-to-append-special-character-in-ios-using-swift?noredirect=1#comment94471584_53810969 what is wrong... — Gowthaman M, Dec 17 '18 at 09:26

Angel F Syrus · Answer 3 · 2018-11-27T09:34:15.970

I think you want to check it in appDelegate. Nowadays I am also working with UITabbarcontroller.I suggest to set a tag(using userDefaults) for checking that the user is logging in or not . And my code is

class AppDelegate: UIResponder, UIApplicationDelegate , UITabBarControllerDelegate , GIDSignInDelegate{

    var window: UIWindow?

    var userCurrentLocation : CLLocation?
    var mapView : GMSMapView?

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

        if UserDefaults.standard.value(forKey: "LoginStatus")as? String == "1"
        {
            let storyBoard = UIStoryboard(name: "Main", bundle: nil)
            let initailVC = storyBoard.instantiateViewController(withIdentifier: "tabBar")
            let navVC = UINavigationController(rootViewController: initailVC)
            self.window?.rootViewController = navVC
        }

        return true
    }

I am using this code to check if the user is logging in it will redirect into TabBarController and if not it will remain in LoginVC.

score 0 · Answer 4 · edited Jun 20 '20 at 09:12

0

Embed your UITabBarController in a UINavigationController

UINavigationController(rootViewController: UITabBarController(nibName: "TabBarNibName", bundle: Bundle.main))
Just push from the navigation controller of your TabBarController

tabbarcontroller.navigationController?.pushViewController(vc!, animated: true)

edited Jun 20 '20 at 09:12

Community

1
1

answered Nov 27 '18 at 09:40

Torongo

1,021
1
7
14

`UITabBarController -> Editor -> Embed In -> Navigation Controller)` options are hidden bro...other ViewController it's showing....only UITabBarController I am not able to set the NavigationController – Gowthaman M Nov 27 '18 at 09:51

How to navigate UITabBarController to ViewController?

4 Answers4

Present UIViewController

Embed in UINavigationController