I have a question

So I’m a beginner I’m using Pythonista 3 and the I wanted to show a text off on a Textview and now I’m wondering how to do this, The best I achieved was to make that when I press a button I can get an output. But now I want to show the output on an TextField in the ui and I don’t no how to do that, I searched maybe an hour on the Internet and I couldn’t find an easy answer for my not that great English speaking me. I hope someone can Answer me my I think easy question😄