How can i add NSSpeechSynthesizer Class Reference.
I think it is in
/System/Library/Frameworks/AppKit.framework.
However there is no such framework name
VSSpeechSynthesizer is available for the iOS - but it is a private API and as such will likely be rejected from the app store. However you can still make apps for private consumption. I consider this a bug as it makes creating accessible apps for the partially sighted for instance, harder. I have filed Bug ID #: 9451650 Bug Title: VSSpeechSynthesizer is Private
I currently use Flite TTS in my App. All hopes fix on the Nuance integration in iOS5 being available as a public API.