iOS UItableviewCell清除旧单元格值

First of all sorry for asking this as I know there are a lot of questions which are similar to this. But so far nothing has worked for me. I have a table view with two buttons. On click of the button it loads two different custom cells. But I can't seem to clear out the old cell values no matter what I try. I have tried the prepareForReuse method to clear the old views but I end up with nothing displaying on the cells.First of all sorry for asking this as I know th