UIKeyboardWillShowNotification not called on switching keyboards on iOS 11

Question

I'm handling keyboard frame changes with UIKeyboardWillShowNotification and UIKeyboardWillHideNotification. When user opens, hides keyboard or switching keyboards by pressing on the "globe" key, everything works fine - methods called correctly. But if user long-presses on globe and selects keyboard that is higher than current (for example, English keyboard switching to Emoji keyboard), method UIKeyboardWillShowNotification not called. So new keyboard covers 40-50 px of UI.

This happens only when switching from lower to higher keyboard and only on iOS 11.

How to handle keyboard switching in iOS 11 the right way?

Update: Found the same issue in Apple Contacts app (while creating or editing contact) and Calendar app (while creating new event) in simulator (don't have iOS 11 on real device).

Answer 1

I reported this to Apple some time ago, and my bug report was closed as a duplicate, so they're aware of it. Nothing we can do about this except wait for an iOS update.

For reference, here's the openradar: http://openradar.appspot.com/radar?id=5026499329523712