Programmatically change rootViewController of storyBoard
IosUiviewcontrollerStoryboardIos Problem Overview
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
-
Remove
Storyboards
from app.plist file, -
Uncheck option "isInitialViewController" from
Storyboards
which is checked in case ofTab Bar
controller because its a rootViewController
, -
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:.
Ios Solutions
Solution 1 - Ios
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!
Solution 2 - Ios
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;
Solution 3 - Ios
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
Solution 4 - Ios
I use simple this:
UIStoryboard *sb = [UIStoryboard storyboardWithName:@"NameOfStoryBoard" bundle:nil];
UITabBarController *rootViewController = [sb instantiateViewControllerWithIdentifier:@"NameOfTabBarController"];
[[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];
Solution 5 - Ios
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
Solution 6 - Ios
> 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
Solution 7 - Ios
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!
Solution 8 - Ios
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];
}
Solution 9 - Ios
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