How to add a footer to a UITableView in Storyboard
You can just drag a view to the bottom area of the tableView. You'll see in the hierarchy that it will be a subview of the tableview. You can then drag subviews such as labels and buttons there, adjust the height, etc.
The above answer worked for me with one twist. I found I couldn't add a footer if the cells filled up the entire height of the table view. Removing a couple of cells allowed me to add the footer, after which I was able to add the cells back.