In my app I have a UISearchBar inside modally presented (as a formSheet) UIViewController. There is searchBar.becomeFirstResponder() called on viewDidAppear as I need keyboard to be shown immediately.
I've noticed, that in some undetermined occasions I can't see a UICalloutBar to paste a text in search bar. Most of the times when UICalloutBar is missing are after switching fro and to the app back again to copypaste some text.
Also inspecting with 'Debug View Hierarchy' shows that whenever UICalloutBar is missing there also a layout warning present 'Position and size are ambiguous for UIKBInputBackdropView.'
UITextEffectsWindow and UIWindow looks like this:
As you can see there is _UIVisualEffectBackdropView is missing from UICalloutBar's stack. However if some text is present already _UIVisualEffectBackdropView is drawn correctly.
The problem persists until complete app restart regardless of dismissing and presenting the other views. Sometimes it resolves by itself when the new text is paste over single space like on a last screenshot.
I'd be really happy if someone have any thoughts on workaround for this issue.
The problem's found on device under iOS 13, app built with Xcode 11.5.