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iosvoiceoveruiaccessibility

iOS Accessibility - is there a way to tell when VoiceOver has changed focus?

I'd like to call a method every time a different element is focused while VoiceOver is active. I was hoping there would be some UIAccessibilityNotification for this, but I can't seem to find any.

Ultimately, my goal is to add an additional condition prior to reading the accessibility label. For example, as opposed to saying (by default) "If UIButton becomes focused: read label", I'd like to be able to say "When UIButton becomes focused AND UIButton's background color is blue: read label".

So my question is: how do I either add an additional condition prior to reading the label, or receive a notification when a new element becomes focused?

Solution

  • You can use the UIAccessibilityFocus protocol to detect changes in focus by accessibility clients (including VoiceOver). Note that UIAccessibilityFocus is an informal protocol that each accessibility element must implement independently.

    That said, for your use case, Aaron is right to suggest returning a different accessibilityLabel under each condition.