I am pushing a new UINavigationController onto the navigation stack. But
instead of having the default transition migrating to new UIBarButtonItems
I want to animate the layout of the existing items. (at least that's how it
should look like)

Trying to explain this more visually:

Animating from

[ [textfield       ] [button] ]

to

[ > [textfield              ] ]

So I would like to
...fade out the right button
...move the textfield and adjust its size
...fade in the back button

Right now I am seeing no good way of doing this but wrapping the whole
navigation controller and then overlay a fake UINavigationBar.

But then again the animation should be interactive with the back/swipe
gesture - which adds another complication to this.

Any thoughts on how you would tackle this?

cheers,
Torsten
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