iOS Voiceover status

Question

I am trying to add accessibility features to an iOS app that has already been developed.

There are a couple of UI features (e.g. buttons) that I like them to show up if

Answer 1

As a supplement to all the previous correct answers, since iOS11 and according to this Accessibility options recap, the new notification name to be used is :

• UIAccessibilityVoiceOverStatusDidChange (SWIFT < 4.2).
• UIAccessibilityVoiceOverStatusDidChangeNotification (ObjC).

... while UIAccessibilityVoiceOverStatusChanged is deprecated.

EDIT for SWIFT 4.2 ==> UIAccessibility.voiceOverStatusDidChangeNotification