How to scroll UITableView to specific position

How can I scroll the table's cell to specific position ? I have a table which shows 3 rows (according to height). what I want is if I click on 1st row than according to table's height the 1st row should scroll and get new position (center) and same for other rows. I tried contenOffset but did not work..

EDITED :

In short some thing like data picker when we select any row in picker the row scrolls to the center.

Thanks..