Status Bar Disappears on Modal Presentation

Question

In my iOS app, I am modally presenting a View Controller (AVPlayerViewController, in this case) using a transition.

At the start of the transition, the Status Bar disappears instantly and yanks up the contents of the app in an ugly jerk, before the animation (of whatever kind--crossfade, cover vertical) hides the underlying stack of view controllers. The new modally presented VC has a status bar on it.

I'd like to not have the status bar vanish at the start of the modal presentation animation.

I set up a blank project and mocked the same basic structure of my app, and when a view controller is presented, the status bar remains stationary during the transition.

What would cause the status bar to vanish at the start of a modal presentation animation?

(Tested on iOS 11 on iPhone X and iOS 10/9 on simulators.)

EDIT:

To perform the presentation, the root view controller of the app is listening for a notification and calling, roughly:

let vc = AVPlayerViewController()
// configure the player
self.present(vc, animated: true) {
    vc.player?.play()
}

This is what produces the odd vanishment.

Interestingly, when I go into the Storyboard and set up a Modal Segue (to a blank view controller) from that same root view controller, triggered off a randomly-added-button, the resultant transition is smooth.

Another data point is that when I turn off animation in present(:animated:completion:) the status bar stays put until the modal is covering it.

"What would cause the status bar to vanish at the start of a modal presentation animation?" Something that is different in your project from the blank project. But whatever it is, you have not told us about it. You haven't told us anything about what you're doing. — matt
@matt Valid. Funny that I have often seen your comments on SO pointing out such lack of data in peoples' questions, and now have experienced it myself. I put a little more data, but it may still not be enough to elicit help. When I resolve the issue, I'll answer it and re-frame the question so that it is useful. — Matt Mc
Yes, the joke is that I often say, "Try this with a plain vanilla project straight from the template", and you've already done that test — which is brilliant. So we are 9/10 of the way there: we know that you are doing something that causes the issue. But, as I say, you have not given us a clue as to what it might be. :) — matt
If you can reproduce the problem in a very minimal project and post it, I'll be glad to look at it. No guarantees I can figure it out but it's always fun to try. — matt
@matt Thanks for the offer! In the course of attempting to reproduce the problem for you, I discovered that this occurred when modally presenting an AVPlayerViewController specifically, and only on iOS 9 and iOS 10. So...I'm not sure why that occurs, but my solution for now is to disable animation on the presentation. — Matt Mc

Matt Mc Matt Mc · Accepted Answer · 2018-02-19T02:05:29

In my case, this was specifically an issue when modally presenting an AVPlayerViewController in iOS 9 and iOS 10. The issue seems to be resolved in iOS 11.

What I was seeing on iOS 11 was a slightly different issue--that of modally presenting an AVPlayerViewController in forced landscape mode, which was causing the status bar to flip orientation at the start of the animation.

Status Bar Disappears on Modal Presentation

1 Answers