TextView pointer not advancing.

Have created an app for IOS Swift using button values placed in a text View. Pressing any button, the value is inserted at the top left of the view. Pressing another button, the value replaces the first button value. The pointer does not advance. I have dismissed the system keyboard via responder as only button values will be used for text entry and edit. I have spent hours looking at Apple docs, apple forums, Apple programming books and Apple videos. I have filed a TSI on 1 Sep 22 with no response. Any ideas would be deeply appreciated. Thanks...CharlieMO