How to move back to the root view controller in storyboard?

Question

What I want to do seems pretty simple, but I can't find any answers on the web. I have the login screen as the root view controller and then tab bar controller and in every tab I have a navigation controller.

I have used storyboard and the hierarchy is described below,

Root VC
    |
     --- tabbar controller
          |
           ---Navigation Controller
                |
                 --- VC1

Requirement is to navigate back to the root view controller from VC1. How can we achieve this?

Answer 1

I got the resolution to the issues using the "Unwind Segues".

Step 1) The bare minimum you need is to subclass the view controller for your destination view (aka, a view that has popped up previously in navigation and you want to unwind to it) and add a method like this to it (the method name can be anything you want, but it should be unique because all unwind segues in your entire app are listed together):

- (IBAction)unwindToViewControllerNameHere:(UIStoryboardSegue *)segue {
//nothing goes here
}

Step 2) Now, in your source view (aka, the view that you want to unwind from) you simply drag a segue from your button or whatever down to the little green "EXIT" icon at the bottom of your source view. There should now be an option to connect to "- unwindToViewControllerNameHere"

That's it, your segue will unwind when your button is tapped. And we can move to any view controller we want and rest of the view controllers will be released.

Answer 2

If you have controllers hierarchy like

--- Navigation Controller -- | Root VC | --- tabbar controller | --- Navigation Controller -- | --- VC1

and there is a UIButton on VC1, so on click of that you want to move to root viewcontroller (Root VC) then use :

-(void)moveToRootViewController {

    //Move to root viewController
    UINavigationController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"mainnav"];

    self.view.window.rootViewController = controller;

 }

here mainnav is storyboard identifier of root viewcontroller Navigation Controller.

According to picture white colour viewcontroller is a root viewcontroller and tabBarController have 2 tabs with navigation controller and if you want to move to root viewcontroller from second tab viewcontroller UIButton(black colour) click then use the above code.

If you have hierarchy like --- Navigation Controller -- | Root VC | --- VC1---- |--- VC2---- |

and want to move to root viewcontroller (Root VC) from VC1 or from VC2 then use :

[self.navigationController popToRootViewControllerAnimated:YES];