A key indicating whether the spoken text is queued behind, or interrupts, existing spoken content.
- iOS 11.0+
- tvOS 11.0+
- watchOS 4.0+
The value of this key is an
NSNumber object interpreted as a Boolean value. When the value is
true, this announcement is queued behind existing speech. When the value is
false, the announcement interrupts the existing speech. The default behavior is to interrupt existing speech.