Workaround for custom UIViewController animations in landscape?

Question

I have a custom animated UIViewController transition, and it seems that there is a bug in iOS that screws up the layout in landscape orientation. In the main animation method, i

Answer 1

The existing answer goes part way but not all the way (we want proper frames and rotation handling on both devices, all orientations, for both animated and interactive transitions).

This blog post helps:

http://www.brightec.co.uk/blog/ios-7-custom-view-controller-transitions-and-rotation-making-it-all-work

And it quotes an Apple Support person stating the true nature of the problem:

"For custom presentation transitions we setup an intermediate view between the window and the windows rootViewController's view. This view is the containerView that you perform your animation within. Due to an implementation detail of auto-rotation on iOS, when the interface rotates we apply an affine transform to the windows rootViewController's view and modify its bounds accordingly. Because the containerView inherits its dimensions from the window instead of the root view controller's view, it is always in the portrait orientation."

"If your presentation animation depends upon the orientation of the presenting view controller, you will need to detect the presenting view controller's orientation and modify your animation appropriately. The system will apply the correct transform to the incoming view controller but you're animator need to configure the frame of the incoming view controller."

But it doesn't address interactive transitions.

I worked out a complete solution to the problem here:

https://github.com/alfiehanssen/Cards

Essentially, you need to calculate the frames of your viewControllers based on the orientation of one of the viewControllers (toViewController or fromViewController) rather than the bounds of the transitionContext's containerView.