tableview指定刷新

//一个section刷新

NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:2];
[tableview reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];

//一个cell刷新

NSIndexPath *indexPath=[NSIndexPath indexPathForRow:3 inSection:0];
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationNone];

// 滚动到指定位置
[self.tableView reloadData];
NSIndexPath * dayOne = [NSIndexPath indexPathForRow:0 inSection:2];
[self.tableView scrollToRowAtIndexPath:dayOne atScrollPosition:UITableViewScrollPositionTop animated:YES];