How to detect VoiceOver status changes in Mac app

Question

Created Feb ’20

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I have a Mac application.

I want to enable / disable some app functionality depending upon if VoiceOver has been enabled or not.

I know that I can detect if VoiceOver has been enabled / disabled using [[NSWorkspace sharedWorkspace] isVoiceOverEnabled].

Apart from this, I want to register for a notification to detect the changes in VoiceOver status (enabled / disabled).

I found that, this can be achieved in iOS by registering to UIAccessibilityVoiceOverStatusDidChangeNotification notification.

But, I did not find similar notification for macOS.

Can anyone please let me know how can I achieve this in macOS.

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Answer 1

DTS Engineer OP

Apple

Feb ’20

The doc comment associated with the

voiceOverEnabled

property in

<AppKit/NSAccessibility.h>

makes it clear that you can watch for changes using KVO:

/* Indicates if VoiceOver is currently running. This is observable through KVO. */

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