Broadcasting Updates
Your application should post notifications to let the VoiceOver accessibility system know about onscreen element changes outside direct user interaction:
When you add or remove a GUI element the UIAccessibilityLayoutChanged-Notification gives the VoiceOver accessibility system a heads-up about those changes.
Applications can post a UIAccessibilityPageScrolledNotification after completing a scroll action. The notification’s object should contain a description of the new scroll position (for example, “Page 5 of 17” or “Tab 2 ...
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