Returns a Boolean value indicating whether VoiceOver is running.
- iOS 4.0+
- tvOS 9.0+
YES if VoiceOver is currently running; otherwise,
You can use this function to customize your app’s UI specifically for VoiceOver users. For example, you might want UI elements that usually disappear quickly to persist onscreen for VoiceOver users. Note that you can also listen for the
UIAccessibility notification to find out when VoiceOver starts and stops.