以编程方式更改 storyBoard 的 rootViewController

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:.

Answer 1

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!

Answer 2

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;

Answer 3

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

Answer 4

I use simple this:

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

Answer 5

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

Answer 6

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

Answer 7

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];
}

Answer 8

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

Answer 9

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!