There are two possible events when a table row is tapped: selecting the row and the accessory view (usually the "more details" type action).
As long as you have registered a delegate for the UITableView, the following can be implemented and will be called on a touch:
// Tap on table Row
- (void) tableView: (UITableView *) tableView didSelectRowAtIndexPath: (NSIndexPath *) indexPath { ... }
// Tap on row accessory
- (void) tableView: (UITableView *) tableView accessoryButtonTappedForRowWithIndexPath: (NSIndexPath *) indexPath{ ... }