When VoiceOver is running, I tapped a button, or a label, it will announce something about this button or label. I want to do something when announcement completed. Is there some notifications to help me observe when the announcement is completed? Thanks!
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Not exactly, no. However, and this is a terrible hack, you can monitor announcements that you, yourself, issue with UIAccessibilityPostNotification() by subscripting to the UIAccessibilityAnnouncementDidFinishNotification. Provided you queue up speech at the right times, it may be a reasonable assumption that any of your announcements finishing indicates that all system announcements have ended.
Justin
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