Creating a UIView that sticks to bottom of UITableView

Creating a UIView that sticks to bottom of UITableView

I have a grouped UITableView and I'd like to add a UIButton to the very
bottom of my UITableView. I'm using Storyboard and a
UITableViewController. I'm not quite sure where I need to add code or
drag/drop UI Elements. I've tried adding a UIView as the footerview in
Storyboard and then adding a button to that view, but this doesn't have
the desired effect of always staying on the very bottom of the view,
similar to a tabbar. Also, the button should always stay in the forefront,
and the UITableView should scroll behind it.
// tried this but it didn't work:
self.tablview.tableFooterView = [[UIView alloc] initwithview...]