When creating a form using three20 components with the methodology found in this example code, there are some strange behaviors with multiple TTTextEditors and UITextFields. Sometimes the fields disappear when touching the next one to enter text. After scouring for a solution, I found someone else with the same problem. Thought it would be useful to see it in his/her words.
My code hardly differs from the example given with three20 so I suspect it is a bug with the library. I too have tried self.autoresizesForKeyboard = NO; but find that it makes typing in a hidden (by the keyboard) field impossible.
I may have found the few lines of code to fix it!
http://github.com/noahmiller/three20/commit/577af26ed4cd636f152e2321fdc6ab08787452af
I found this link via this message https://github.com/facebook/three20/issuesearch?state=open&q=autoresize#issue/139