How can I notify to VoiceOver an event so it can be announced (iOS)?

Hi,
I'm creating app for blind people. When I was developing for Mac I could use the NSSpeechSynthesizer interface to get accesso to voices APIs, but I found that this is not possible on the iOS because the voice API are not public.
The problem I'm facing is simple. I have an application the does some things. As a result it should announce to the user the produced calculation. So, due we can't use voice apis, i suppouse the VoicOver must be active. The question is: how can I notify VoiceOver to read a label o something else when I finished the required task?
Thank you for helping...

If the calculation is a number, you could pre-record the various amounts needed and then formulate the answer as a combination of the various amounts and then play the resulting sound using AudioServicesPlaySystemSound.

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