Fullscreen issue when doing canceled swiped

[jeannustre]

I've been having an issue with the fullscreen view on iOS 10. It can easily be reproduced in the example app with the following steps :

• Open the fullscreen view
• Perform small vertical swipes (the gesture used to discard the page) but without committing (either by releasing the gesture very early, or by going back near the initial position of the gesture)
• At some point the gesture will stop functioning, and the following will be printed to the console :

  2018-05-22 17:24:48.904402+0200 ImageSlideshow_Example[271:11867] Warning: Attempt to present <ImageSlideshow.FullScreenSlideshowViewController: 0x1013278b0>  on <ImageSlideshow_Example.ViewController: 0x101209040> which is already presenting (null)

• At this point if we close the fullscreen view by tapping the top-left button, it dismisses then shows a completely black screen from which we can not return without closing the app (looks to me like a UIWindow without any root view controller, but I'm not sure about this)
• In addition to the swipe gesture stopping functioning, the top-left button may also disappear and thus lock the user in the fullscreen view. When this happens, nothing is printed to the console, but all touch events stop responding (including the double-tap to zoom and left/right swipe to change the current page).

I'll try to investigate further and update this issue with anything relevant I find.

[zvonicek]

Hi, thanks for the report! It took some hacking around to get ZoomAnimatedTransitioning.swift working on iOS 11 while supporting iOS 9 and older (without UIPropertyAnimator), but it looks it broke iOS 10... Seems Apple changes how interactive transitions works in every major iOS release 🙁.

I'll try to look at it when have some time. In the meanwhile, I'll be happy for any updates or even PR fixing this issue!

[giuliatardozzi]

Hello,

any news about this bug?

Thanks a lot!

[andrewabdalla]

Also looking for any update/potential workaround for devices with iOS 11+

• Cheers!

[zvonicek]

Hi, I'll probably just disable interactive transitioning on iOS 10 and older, I currently don't have capacities to focus on supporting it fully. iOS 11+ should work well, as far as I know.