UIDocumentInteractionController in landscape mode

The whole iOS version of Babel works in portrait mode, but since we implemented attachments, we wanted to display attachment previews in landscape mode also. We tried it at first with UIDocumentInteractionController, which is displayed modally on UINavigationController.

So the whole app is in portrait mode and only UIDocumentInteractionController is in both portrait and landscape. It worked great, but when you at first turn the iphone to landscape and then display UIDocumentInteractionController, you will see the preview, but the navigation bar is missing. So you cannot get out of this screen, in iOS 8, it looks like this:

In iOS 7, it's ok:

We tried using QLPreviewViewController, but displaying it modally on UINavigationController was the same. Then we tried to push it on the navigation stack with pushViewController:animated and finally it worked on both iOS versions 7 and 8.

However there is one issue with QLPreviewViewController that only occurs in iOS 8 (iOS7 is ok). When you try to play some sound in this preview and turn to landscape, then when you go back (dismiss QLPreviewViewController), the sound continues playing. If you do the same thing in portrait, it stops playing.