It turns out, the easiest way to do this is using Interface Builder:
- Add a IBAction (to the ViewController, say, as in this case)
- Ctrl-Click (or right click) on the UITextField in Interface Builder
- Connect the “Editing Changed” event to the File’s Owner’s IBAction added in the first step.
Works like a charm 🙂 (I can’t believe I spent numerous days on this, and to realize now that the solution was much simpler than I’d thought :P)