I thought you are talking about the Mac.
NSTableView is a class from AppKit, it's Cocoa.
UITableView is a class from UIKit, it's Cocoa Touch.
I do not know for sure. I'm too lazy to make iPhone programs. How I know, UITableView has only one column.
Here is a nice article about UITableView (the code included):
http://cocoawithlove.com/2009/04/easy-custom-uitableview-drawing.html