How to change text on a back button

Question

By default the back button uses as a text on it a title of a viewcontroller. Can I change text on the back button without changing a title of a view controller? I need this

Answer 1

My solution was to set title when the view controller is pushed to navigation stack and reset it by use of delegate method before pushed vc closes:

So I put the title change in calling view controller when I push the other view controller like:

self.pushedVC = [self.storyboard instantiateViewControllerWithIdentifier:@"pushedVCIdentifier"];
self.pushedVC.delegate = self;   
[self.navigationController pushViewController:self.pushedVC animated:YES];
self.title = @"Back";

and in delegate callback function (which I invoke in viewWillDissapear):

-(void)pushedVCWillClose:(PushedVC *)sender
{
    self.title = @"Previous Title";
}