validate textfield inside tableviewcell

[rajdhakate]

I've a form page, with more than 6 cells. each cell have a textfield with a single reusable identifier.

i've successfully implemented the validation on a submit button click when i've less than 6 cells. in this case all the cells are visible on view.
problem arises when there are some cells out of the view, so calling [tableView cellForRowAtIndexPath:] returns a nil cell.
since i can not get a cell which is out of the view, it can't be checked for validation.

any advice on this problem?