Block reordering in a specific cell of a TableView

I found the answer!

You can use the method targetIndexPathForMoveFromRowAtIndexPath from UITableViewDelegate.

-(NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath{
    if (proposedDestinationIndexPath.row == 0) {
        return sourceIndexPath;
    }
    return proposedDestinationIndexPath;

}