Programmatically change rootViewController of storyBoard
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:.
Solution 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!
Solution 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;
Solution 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
Solution 4:
I use simple this:
UIStoryboard *sb = [UIStoryboard storyboardWithName:@"NameOfStoryBoard" bundle:nil];
UITabBarController *rootViewController = [sb instantiateViewControllerWithIdentifier:@"NameOfTabBarController"];
[[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController];
Solution 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