Programmatically change rootViewController of storyBoard

Question

I have created my project using Storyboards. The root ViewController lies inside a Storyboard, I have not written a single code in the appDelegate.

Now I want to show a tour of my app, so I want to change the root ViewController from Tab Bar to my TourVC and when the tour of the app is finished , I want to again switch back my root ViewController to Tab Bar.

So I looked up online and followed the following points

1) Remove Storyboards from app.plist file, 2) Uncheck option "isInitialViewController" from Storyboards which is checked in case of Tab Bar controller because its a root ViewController, 3) Add this code in appDelegate.m file.

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
ProductTourViewController *PT = [[ProductTourViewController alloc] initWithNibName:@"ProductTourViewController" bundle:nil];
self.window.rootViewController = PT;
[self.window makeKeyAndVisible];
return YES;

But my app crashes with this error log,

[ProductTourViewController selectedViewController]: unrecognized selector sent to instance 0x1766a9e0

And also I get a warning,

Unsupported Configuration: Scene is unreachable due to lack of entry points and does not have an identifier for runtime access via -instantiateViewControllerWithIdentifier:.

Carlos Irano · Accepted Answer · 2020-08-31 13:27:17Z

176

Objective-C:

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UITabBarController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"tabBarcontroller"];
[[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];

Swift :

 let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
 let viewController = mainStoryboard.instantiateViewControllerWithIdentifier("tabBarcontroller") as UITabBarController  
   UIApplication.sharedApplication().keyWindow?.rootViewController = viewController;

Swift 3:

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = mainStoryboard.instantiateViewController(withIdentifier: "tabBarcontroller") as! UITabBarController
UIApplication.shared.keyWindow?.rootViewController = viewController

Swift 5:

let viewController = mainStoryboard.instantiateViewController(withIdentifier: "tabBarcontroller") as! UITabBarController
UIApplication.shared.windows.first?.rootViewController = viewController
UIApplication.shared.windows.first?.makeKeyAndVisible()

Or simply like this:

let viewController = mainStoryboard.instantiateViewController(withIdentifier: "tabBarcontroller") as! UITabBarController
self.view.window?.rootViewController = viewController
self.view.window?.makeKeyAndVisible()

Both works fine!

edited Aug 31, 2020 at 13:27

Carlos Irano

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answered Mar 26, 2014 at 7:22

Sunny Shah

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13 Comments

Ranjit Over a year ago

So what about removing storyBoard from plist file and unchecking intialViewController. Also the newRootVC is not inside storyBoard.

Sunny Shah Over a year ago

no storyboard will be there your root viewcontroller will be changed

Ranjit Over a year ago

Hello, now on application launch, I made my productTour VC as the rootVC, now when the user exits ProductTour, I want to again shift my root VC to TabBar, how to do that

LpLrich Over a year ago

I have edited the code and submitted the edits. I am using it in my application.

Anton Gaenko Over a year ago

just want to note that during didFinishLaunchingWithOptions application haven't set keyWindow yet, so you should using self.window.rootViewController = ... in such case

|

Mayank Jain · Accepted Answer · 2014-03-26 09:50:10Z

11

enter image description here Set storyboard ID for your class in your main storyboard.

UIStoryboard *MainStoryboard = [UIStoryboard storyboardWithName:@"Main"
                                                                     bundle: nil];

UINavigationController *controller = (UINavigationController*)[MainStoryboard
                                                                           instantiateViewControllerWithIdentifier: @"RootNavigationController"];


LoginViewController *login=[MainStoryboard instantiateViewControllerWithIdentifier:@"LoginViewController"];
            [controller setViewControllers:[NSArray arrayWithObject:login] animated:YES];
self.window.rootViewController=controller;

edited Mar 26, 2014 at 9:50

answered Mar 26, 2014 at 9:29

Mayank Jain

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4 Comments

Ranjit Over a year ago

same as above in my question ...please check

Ranjit Over a year ago

Hello @Mayank, did you get it.

Ranjit Over a year ago

Guys sorry, there was some code in ApplicationBecomeActive, which was causing this problem and its solved now. thanks everyone, you are right.

Ranjit Over a year ago

Hello, now on application launch, I made my productTour VC as the rootVC, now when the user exits ProductTour, I want to again shift my root VC to TabBar, how to do that

Nischal Hada · Accepted Answer · 2016-03-09 17:33:37Z

7

In swift we can implement it is as following

let storyboard = UIStoryboard(name: "StartingPage", bundle: NSBundle.mainBundle())      
let loginView: SignInVC = storyboard.instantiateViewControllerWithIdentifier("SignInVC") as! SignInVC
UIApplication.sharedApplication().keyWindow?.rootViewController = loginView

answered Mar 9, 2016 at 17:33

Nischal Hada

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Comments

Carlos Irano · Accepted Answer · 2020-08-30 23:52:54Z

4

Swift 5 + Xcode 11:

Make like this:

let viewController = mainStoryboard.instantiateViewController(withIdentifier: "tabBarcontroller") as! UITabBarController
UIApplication.shared.windows.first?.rootViewController = viewController
UIApplication.shared.windows.first?.makeKeyAndVisible()

Or like this:

let viewController = mainStoryboard.instantiateViewController(withIdentifier: "tabBarcontroller") as! UITabBarController
self.view.window?.rootViewController = viewController
self.view.window?.makeKeyAndVisible()

Both works fine!

answered Aug 30, 2020 at 23:52

Carlos Irano

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1 Comment

Rana Ali Waseem Over a year ago

I'm using the first answer in my scene delegate (willConnectTo) it's working but when I kill the app forcefully and open it again then app is not opening. And if change root view controller in app delegate its not working fine.

MUHAMMAD WASIM · Accepted Answer · 2014-11-25 04:25:35Z

3

I use simple this:

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"NameOfStoryBoard" bundle:nil];
UITabBarController *rootViewController = [sb instantiateViewControllerWithIdentifier:@"NameOfTabBarController"];
[[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];

answered Nov 25, 2014 at 4:25

MUHAMMAD WASIM

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1 Comment

Dmitry Grigoryev Over a year ago

How is this code snippet different from the accepted answer?

Aldo Gomez · Accepted Answer · 2016-10-21 13:20:40Z

3

Just to add to Sunny Shah's answer, this is the Swift 3 version of it:

        let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let viewController: UIViewController = mainStoryBoard.instantiateViewController(withIdentifier: "MainTabBarController") as! UITabBarController
        UIApplication.shared.keyWindow?.rootViewController = viewController

answered Oct 21, 2016 at 13:20

Aldo Gomez

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Comments

Karan Dua · Accepted Answer · 2017-06-08 09:50:21Z

3

Swift 3 code:

Use below in didFinishLaunchingWithOptions Appdelegate function. Replace "HomeViewController" with ViewController you want to set as Root ViewController on app launch.

self.window = UIWindow(frame: UIScreen.main.bounds)

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

let initialViewController = storyboard.instantiateViewController(withIdentifier: "HomeViewController")

self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()

return true

answered Jun 8, 2017 at 9:50

Karan Dua

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1 Comment

rudifa Over a year ago

Thank you for the idea. This worked for me : <code> func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { if ProcessInfo.processInfo.arguments.contains("XCUITests") { window?.layer.speed = 100.0 // speeds up the test in simulator about 3x } return true } </code>

Daniel Tadros · Accepted Answer · 2018-03-29 15:31:11Z

Objective c

step 1: remove main story board from info.plist

step 2: add storyboard id to your view controller in your interface builder

step 3: add the following code to application did finish method in app delegate

self.window = [[UIWindow alloc] initWithFrame: [UIScreen mainScreen].bounds];


//set main story board
if( condition){
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"StoryboardName1" bundle:nil];
    UIViewController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"ViewController1"];
    [[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];
    [self window].rootViewController = rootViewController;
    [self.window makeKeyAndVisible];
}else{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"StoryboardName2" bundle:nil];
    UIViewController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@"ViewController2"];
    [[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];
    [self window].rootViewController = rootViewController;
    [self.window makeKeyAndVisible];
}

WaFuNuke · Accepted Answer · 2018-06-21 13:47:14Z

2

This is an old article, but I will reply. I do not recommend the following code.

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = mainStoryboard.instantiateViewController(withIdentifier: "tabBarcontroller") as! UITabBarController
UIApplication.shared.keyWindow?.rootViewController = viewController

Because you are creating two instances. I recommend writing the following code in the appropriate ViewController.

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

answered Jun 21, 2018 at 13:47

WaFuNuke

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