UINavigationBar custom transition animation

Question

I\'ve created custom transitions between view controllers using the following protocols:

UIViewControllerAnimatedTransitioning and UIViewControll

Answer 1

WWDC 2013 video #218 indicates that all custom transitions will crossfade the navigation bar, and that there's no way to customize this behavior.

Answer 2

If your transition is both custom and interactive, then you can get some mileage out of UIViewControllerTransitionCoordinator.
see Here.

For example, in viewWillAppear of the view controller that is the "To" (target) vc:

[[self transitionCoordinator] animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {

    // mess around with stuff here

} completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {

    // all done now
}];