Swift - Text to speech

1. Add the following line to the class you want to use text to speech in "import AVFoundation"
2. Create a speech synthesizer: let speechSynthesizer = AVSpeechSynthesizer()
3. Create a speech utterance: let speechUtterance = AVSpeechUtterance(string: "Hello world!")
4. Apply your desired properties to the speech utterance, e.g:
   • speechUtterance.rate : how fast or slow the string will be spoken, acceptable values are between 0.0 and 1.0
   • speechUtterance.volume : how loudly the string will be spoken, acceptable values are between 0.0 and 1.0
   • More properties can be found on the AVSpeechUtterance reference page.
5. Use the speech synthesizer to speak the utterance: speechSynthesizer.speakUtterance(speechUtterance)