How to remove a specific view controller from uinavigationcontroller stack?

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I have a uinavigationcontroller. After logged in i want to remove viewcontrollers like RegisterViewController,LoginViewController etc from UInavigationcontroller stack..

I mean i have to remove a particular view controller from stack ? How its possible. ?

I checked this post

http://starterstep.wordpress.com/2009/03/05/changing-a-uinavigationcontroller’s-root-view-controller/

So we can take it into an array like 

NSArray *allviewcontrollers= [(UINavigationController *)navigationController viewControllers];

But how to do further process.. This question is hunting me for long time..Please answer me ..Thanks in advance

uinavigationcontroller navigation objective-c iphone
2 Answers
NSMutableArray *allViewControllers = [NSMutableArray arrayWithArray: navigationController.viewControllers];
[allViewControllers removeObjectIdenticalTo: removedViewController];
navigationController.viewControllers = allViewControllers;
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