Table view buttons and title disappears after going back from full screen presented controller

[ManueGE]

Describe the bug
Table view buttons and title disappears after going back from full screen presented controller.

To Reproduce

• Start observing a collection view (or table view) scroll.
• Scroll to hide the nav bar
• Present a modal view controller with full screen
• Stop observing (in viewWillDissapear) with showingNavBar = false
• Dismiss the presented view controller
• The original controller has the nav bar displayed and all its items (title, buttons) are transparent.

You can also reproduce it by adding this code to CollectionViewController.swift in the demo app.

// line 38, replace commented line
// navigationController.stopFollowingScrollView()
navigationController.stopFollowingScrollView(showingNavbar: false)

// line 44, replace commented lines
// let storyBoard = UIStoryboard(name: "Main", bundle: nil)
// let mainViewController = storyBoard.instantiateViewController(withIdentifier: "TestViewController")
// self.present(mainViewController, animated: true, completion: nil)

let c = UIViewController()
c.modalPresentationStyle = .fullScreen
c.view.backgroundColor = .red
present(c, animated: true)
Timer.scheduledTimer(withTimeInterval: 2, repeats: false) { _ in
  c.dismiss(animated: true, completion: nil)
}

Expected behavior

• The nav bar should remain hidden or at least visible with all this items

[ManueGE]

Also, after going back the navigation bar has isUserInteractionEnabled = false, so it's not tappable.

[andreamazz]

Hey @ManueGE
I think this is UIKit enforcing the navbar height when returning from the presentation, I reckon I have no way of controlling this. The only workaround that I can offer is not calling the stopFollowingScrollview method, the result is not seamless, but it works.