ios PopoverView presentPopoverFromRect in the pop-up view in how to obtain the coordinates of each cell button

I define a ScrollView, which stood several tableView, each cell placed inside a button, I would now like to achieve the effect is to click on each cell of the button, will pop up each button just below a PopoverView, because ScrollView is a sliding view, when the coordinates of the slide does not know how to take, and now the pop-up view coordinates wrong, arrows pointing coordinates presentPopoverFromRect do not know how to obtain, there are experts who know how to do it? I do not know what I said out do not understand. (I This program is run on the iPad simulator.)
Reply:
Your cell is custom or original? If the original position of the button is the same, if not a custom.