Описание тега avspeechsynthesizer
AVSpeechSynthesizer is an audio API included in the iOS 7.0+ SDK. It produces synthesized speech from text on an iOS device and allows you to control the speech.
The AVSpeechSynthesizer class produces synthesized speech from text on an iOS device, and provides methods for controlling or monitoring the progress of ongoing speech.
This API was introduced in the avfoundation framework starting in iOS 7.0.
Official Apple documentation on the AVSpeechSynthesizer API is available here.