I have a bare-bones sample project here:
http://dl.dropbox.com/u/7834263/ExpandingCells.zip
In this project, a UITableView has a custom UITableViewCell. In each
To animate the height changes of a tableView just call.
[tableView beginUpdates]; [tableView endUpdates];
Don't call reloadRowsAtIndexPaths:
See Can you animate a height change on a UITableViewCell when selected?