CODEWITHSUNDEEP
swiftuinavigationcontrollerstoryboard
user2722667
user2722667

Reputation: 8661

How to set a new root view controller

I wonder if its possible to set a new root VC?

My app gets init with a uinavigation controller that has a table view to be the root VC.

Then from the table view I am running another segue to a login window (present modally) If you then login you end up in the red VC/account page. What I want to do now is to set the red VC to be the new root VC of the app, and remove all underlying VC's. So that I can show a menu button/icon instead of a "Back" button

I have found this but I dont understand how to use it:

let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
        let yourViewController: ViewController = storyboard.instantiateViewControllerWithIdentifier("respectiveIdentifier") as! ViewController

        let navigationController = self.window?.rootViewController as! UINavigationController
        navigationController.setViewControllers([yourViewController], animated: true)

But I cannot get it to work. So is it possible to make the red vc in the picture act as the new root VC.

enter image description here

Upvotes: 43

Views: 134423

Answers (25)

Shakeel Ahmed
Shakeel Ahmed

Reputation: 6021

Swift 5+ IOS 13+

extension UIViewController {
    var appDelegate: AppDelegate {
         return UIApplication.shared.delegate as! AppDelegate
    }

    var sceneDelegate: SceneDelegate? {
        guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,             
        let delegate = windowScene.delegate as? SceneDelegate else { return nil }
            return delegate
        }
}



//Calling Method
    let storyBoard : UIStoryboard = UIStoryboard(name: "Home", bundle:nil)
    if let navigationController = storyBoard.instantiateViewController(withIdentifier: "NavigationHomeViewController") as? UINavigationController {
        self.sceneDelegate?.window?.rootViewController = navigationController
    }

Upvotes: 0

Priyank Patel
Priyank Patel

Reputation: 880

Swift 4,5

Use this below code for RootViewController

    let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
    let mainViewController = storyBoard.instantiateViewController(withIdentifier: "MainViewController") as! MainViewController
    let navigationController = UINavigationController(rootViewController: nextViewController)            
    if let window = UIApplication.shared.delegate?.window {
        window?.rootViewController = navigationController
     }

Upvotes: 2

user8637708
user8637708

Reputation: 3783

For Swift 5 and above this may work for you.

if let delegate = UIApplication.shared.connectedScenes.first?.delegate as? SceneDelegate {
        
        delegate.window?.rootViewController = newViewController
        delegate.window?.makeKeyAndVisible()
        
}

Upvotes: 2

Navdeep Paliwal
Navdeep Paliwal

Reputation: 379

For Swift 5 Users you can do this way and this will definitely work for you.

var window: UIWindow?

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
    // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
    // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
    // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
    manageLoginSession()
    guard let _ = (scene as? UIWindowScene) else { return }
}

func manageLoginSession() {
    guard let window = window else {return}
    if UserDefaults.standard.bool(forKey: "_key_AlreadyLogin") == true {
        window.rootViewController = UIStoryboard(name: "Dashboard", bundle: nil).instantiateInitialViewController()
    }else{
        window.rootViewController = UIStoryboard(name: "Main", bundle: nil).instantiateInitialViewController()
    }
}

Upvotes: 3

M Murteza
M Murteza

Reputation: 1744

Swift 4,5 and above If you Use Multiple or single Story board you want to set Different Root view controller of Navigation Controler then I use This Method: In My case StoryBaord Name is Auth.

    func setRootToLogin(transition :CATransition) {
    let storyboard = UIStoryboard(name: "Auth", bundle: nil)
    let loginNav =  storyboard.instantiateViewController(withIdentifier: "AuthNavigationController") as! UINavigationController
    window.set(rootViewController: loginNav, withTransition: transition)
    let vc =  window.rootViewController as! UINavigationController
    let loginvc = LoginViewController.instantiateAuth()
    vc.setViewControllers([loginvc], animated: true)
}

Upvotes: 0

Tushar Korde
Tushar Korde

Reputation: 1187

UINavigationController has a viewControllers property, which is a NSArray, And you can replaced it with your own NSArray of view controllrs.

This can be done as show in below sample code.

let newViewController = self.storyboard?.instantiateViewControllerWithIdentifier("YourViewControllerollerID") as! YourViewController
let customViewControllersArray : NSArray = [newViewController]
navigationController?.viewControllers = customViewControllersArray as! [UIViewController]

And if you want to show this new root view controller you can just call UINavigationController's popToRootViewController() method.

navigationController?.popToRootViewControllerAnimated(true)

Upvotes: 8

Sandeep Kakde
Sandeep Kakde

Reputation: 9

Swift 4

 let storyBoard = UIStoryboard(name: "Your_Storyboard_Name", bundle:Bundle.main)
 self.window = UIWindow(frame: UIScreen.main.bounds)
 let yourVc = storyBoard.instantiateViewController(withIdentifier: "YourIdentifier") as? YourViewController
 if let window = window {
     window.rootViewController = yourVc
 }
 window?.makeKeyAndVisible()

Upvotes: 0

Viktor_DE
Viktor_DE

Reputation: 286

Link to a related question

This answer applies to usage of an existing ViewController from somewhere in the current stack without instantiating and reconfiguring a new controller.

The documentation says: The root view controller provides the content view of the window. Assigning a view controller to this property (either programmatically or using Interface Builder) installs the view controller’s view as the content view of the window. The new content view is configured to track the window size, changing as the window size changes. If the window has an existing view hierarchy, the old views are removed before the new ones are installed.

Just as the documentation says: It removes all views in the stack if the rootViewController is exchanged. No matter what's with the controller. So remove the ViewController from the stack to assure its view won't be removed.

This resulted in my case in the following solution:

if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
    guard let pageVC = self.onboardingDelegate as? OnboardingPageViewController else { return } // my current stack is in a pageViewController, it also is my delegate
    let vc = self // holding myself
    pageVC.subViewControllers.removeLast() // removing myself from the list
    pageVC.setViewControllers([pageVC.subViewControllers[0]], direction: .forward, animated: false, completion: nil) // remove the current presented VC
    appDelegate.window?.rootViewController = vc
    vc.onboardingDelegate = nil
    appDelegate.window?.makeKeyAndVisible()
}

Upvotes: 0

Sandeep Maurya
Sandeep Maurya

Reputation: 2099

Swift 4, 5, 5.1

let story = UIStoryboard(name: "Main", bundle:nil)
let vc = story.instantiateViewController(withIdentifier: "NewViewController") as! NewViewController
UIApplication.shared.windows.first?.rootViewController = vc
UIApplication.shared.windows.first?.makeKeyAndVisible()

Upvotes: 36

Navdeep Paliwal
Navdeep Paliwal

Reputation: 379

This is how you can set the nib as root view controller.

 let vc = HomeViewController(nibName: "HomeViewController", bundle: nil)
 window = UIWindow(frame: UIScreen.main.bounds)
 window?.rootViewController = vc
 window?.makeKeyAndVisible()

Upvotes: 0

Muhammad Aakif
Muhammad Aakif

Reputation: 212

Just write this and you are good to go.

let sb = UIStoryboard(name: "Main", bundle: nil)
let VC = sb.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
let navRootView = UINavigationController(rootViewController: VC)
self.present(navRootView, animated: true, completion: nil)

Upvotes: 0

Talha Rasool
Talha Rasool

Reputation: 1152

Any view controller you want to set root just call the below function like 

  UIApplication.shared.setRootVC(vc)

  extension UIApplication {

    func setRootVC(_ vc : UIViewController){

        self.windows.first?.rootViewController = vc
        self.windows.first?.makeKeyAndVisible()

      }
  }

Upvotes: 0

Vashum
Vashum

Reputation: 853

Swift 4.2

May be you should try this

let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
let redViewController = mainStoryBoard.instantiateViewController(withIdentifier: "respectiveIdentifier") as! ViewController
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = redViewController

Upvotes: 49

Amrit Sidhu
Amrit Sidhu

Reputation: 1950

If you need to set rootViewController with some animations, here is the code:

guard let window = UIApplication.shared.keyWindow else {
    return
}

guard let rootViewController = window.rootViewController else {
    return
}

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "MainTabbar")
vc.view.frame = rootViewController.view.frame
vc.view.layoutIfNeeded()

UIView.transition(with: window, duration: 0.3, options: .transitionCrossDissolve, animations: {
    window.rootViewController = vc
}, completion: { completed in
    // maybe do something here
})

Upvotes: 2

Rubaiyat Jahan Mumu
Rubaiyat Jahan Mumu

Reputation: 4127

For swift 4.0.

In your AppDelegate.swift file in didfinishedlaunchingWithOptions method, put the following code.

var window: UIWindow?


func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    window = UIWindow(frame: UIScreen.main.bounds)
    window?.makeKeyAndVisible()

    let rootVC = MainViewController() // your custom viewController. You can instantiate using nib too. UIViewController(nib name, bundle)

    let navController = UINavigationController(rootViewController: rootVC) // Integrate navigation controller programmatically if you want
    window?.rootViewController = navController

    return true
}

Hope it will work just fine.

Upvotes: 3

Anirudha Mahale
Anirudha Mahale

Reputation: 2596

You can try out this code

func switchRootViewController(rootViewController: UIViewController, animated: Bool, completion: (() -> Void)?) {
    guard let window = UIApplication.shared.keyWindow else { return }
    if animated {
        UIView.transition(with: window, duration: 0.5, options: .transitionCrossDissolve, animations: {
            let oldState: Bool = UIView.areAnimationsEnabled
            UIView.setAnimationsEnabled(false)
            window.rootViewController = rootViewController
            UIView.setAnimationsEnabled(oldState)
        }, completion: { (finished: Bool) -> () in
            if (completion != nil) {
                completion!()
            }
        })
    } else {
        window.rootViewController = rootViewController
    }
}

Upvotes: 0

ajw
ajw

Reputation: 2702

Swift 4 Answer 

let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewController(withIdentifier: "YourViewController") as! YourViewController
let navigationController = UINavigationController(rootViewController: nextViewController)            
let appdelegate = UIApplication.shared.delegate as! AppDelegate
appdelegate.window!.rootViewController = navigationController

Upvotes: 9

Deepti Raghav
Deepti Raghav

Reputation: 902

You can use this bit of code:

let newViewController = self.storyboard?.instantiateViewController(withIdentifier: "HomeViewController") as! HomeViewController

let customViewControllersArray : NSArray = [newViewController]
self.navigationController?.viewControllers = customViewControllersArray as! [UIViewController]
self.navigationController?.pushViewController(newViewController, animated: true)

Upvotes: 2

Deepak Tagadiya
Deepak Tagadiya

Reputation: 2245

Swift 3 AppDelegate file:::

@IBAction func btnGoBack(_ sender: UIButton){

   self.goToHomeVC()
}

func goToHomeVC(){

    let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let viewController = storyboard.instantiateViewController(withIdentifier :"HomeVC") as! HomeVC

    let navController = UINavigationController.init(rootViewController: viewController)

    if let window = self.appDelegate.window, let rootViewController = window.rootViewController {

        var currentController = rootViewController

        while let presentedController = currentController.presentedViewController {

            currentController = presentedController
        }

        currentController.present(navController, animated: true, completion: nil)
    }
}

Upvotes: 0

MLBDG
MLBDG

Reputation: 1367

once you are in the vc that you want to set as root, just add in your viewDidLoad:

let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = self

*As per best practice you should check if it is already the root, if not execute the code above.

Upvotes: 0

footyapps27
footyapps27

Reputation: 4042

Swift 3 Update:-

let testController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "testController") as! TestController
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = testController

Upvotes: 23

Amelia
Amelia

Reputation: 185

In order to get the code snippet from the original question to work, I had to make a change to the third line

let navigationController = self.navigationController!

I am using this code in an @IBAction in the view controller that precedes the new root view controller.

Using the original code, I was receiving an error saying that my view controller had no member called window. After looking at the documentation, I could find no property named window. I'm wondering if the original block of code above was intended to be used inside a UINavigationController file.

Here is the block in its entirety.

let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
let todayViewController: TodaysFrequencyViewController = storyboard.instantiateViewControllerWithIdentifier("todaysFrequency") as! TodaysFrequencyViewController    
let navigationController = self.navigationController!
navigationController.setViewControllers([todayViewControl ler], animated: true)

Upvotes: 5

ArturOlszak
ArturOlszak

Reputation: 2673

How and from where are you presenting redVC?

You could make it root view controller of your UINavigationController, so you would still have ability to push and pop view controllers.

self.navigationController?.viewControllers = [self];

Upvotes: 2

Mudith Chathuranga Silva
Mudith Chathuranga Silva

Reputation: 7444

You can use this code when you click the login button :-

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var vc = mainStoryboard.instantiateViewControllerWithIdentifier("respectiveIdentifier") as ViewController  
UIApplication.sharedApplication().keyWindow.rootViewController = vc

Upvotes: 2

Caleb
Caleb

Reputation: 125017

I wonder if its possible to set a new root VC?

Yes, it's possible. How you do it depends on the context...

My app gets init with a uinavigation controller that has a table view to be the root VC.

There are actually two things that are commonly called the "root view controller":

  • UIWindow has a rootViewController property, which is writeable.

  • UINavigationController has no rootViewController property, but it does have an initializer called -initWithRootViewController:. You can set the nav controller's "root" view controller by setting it's viewControllers property.

It sounds like you're trying to change the window's root view controller, but the code you show only changes the nav controller's viewControllers property. Try setting the window's rootViewController property directly. Understand, however, that if you take that approach then the navigation controller will go away too. If you want to keep the nav controller, on the other hand, go with your current approach.

But I cannot get it to work. So is it possible to make the red vc in the picture act as the new root VC.

More information here would be helpful. What do you mean by "cannot get it to work"? What happens, and what do you expect to happen?

Upvotes: 4

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