Changing delete button to an add button in iOS

Changing delete button to an add button in iOS

I have a static table view that will act as a adder/editor of information
in Core Data. Some of the information has multiple strings (like fields in
iOS contacts). I want to change some of the delete button circles(-) with
(+) buttons. How can I do this? I am going for something similar to
contacts.
Thanks in advance for any help!