Specific flow in navigation controller pop view

I have 4 different views (a,b,c,d). User can go from:

a->b,
b->c ,b->d 
c->b ,b->d 
d-> c, d->b

To load a new vi开发者_开发技巧ew I use navitaion controller push view. My question what is the best solution to handle back button in order to make it always work like this:

d->c
c->b
b->a

regardless of all prior view controller pushes.

In the other words user makes the following sequence of transitions: (ie.a->b->c->b->c->d->c) but when he presses back button I want him to see screen B, not previously pushed D.

I know how to solve it in ugly ways but I expect something more elegant.

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UINavigationController supports popping back to a specific view controller through the popToViewController:animated method...

Pops view controllers until the specified view controller is at the top of the navigation stack.

• (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated

Official Apple Docs

I would however recommend rethinking your navigation hierarchy. The Apple Human Interface guidelines recommend following a structured and consistent navigation scheme. Jumping between controllers can be confusing for the user.