UItableView  刷新指定的区域  与 cell  &&  滚动到最底部

1.指定区

NSIndexSet *indexSet=[[NSIndexSet alloc] initWithIndex:3];

[self.tableView reloadSections:indexSet withRowAnimation:UITableViewRowAnimationBottom];

2.指定cell

 NSIndexPath*indexPath = [[NSIndexPathalloc]initWithIndex:1];

[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:UITableViewRowAnimationFade];

3.滚动到最底部

NSIndexPath*ip = [NSIndexPathindexPathForRow:1inSection:3];  //取最后一行数据

[self.tableView scrollToRowAtIndexPath:ip atScrollPosition:UITableViewScrollPositionBottom animated:YES];