Creating an Action Extension on iOS

Lukas Petr on examples of an iOS app extension:

“…you can use a Today extension to create a widget that will appear in Notification Center, a Sharing extension that will let the user share to their social network, or an Action extension that lets the user act on current content—either view it in a different way or change it.”

The tutorial creates an action extension using the speech synthesis API of the AVFoundation framework to read text aloud.