[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:
[self.tableView numberOfRowsInSection:0]-1 inSection:0]
atScrollPosition:UITableViewScrollPositionTop animated:YES];
其它姿勢：
http://stackoverflow.com/questions/1355674/how-to-scroll-a-uitableview-to-the-tablefooterview
