iOS UITableView局部刷新 刷新单个cell或sec

//一个section刷新

NSIndexSet * indexSet = [[NSIndexSet alloc]initWithIndex:1];

[tableview reloadSections: indexSet withRowAnimation:UITableViewRowAnimationAutomatic];

//刷新单个Cell
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:2 inSection:1];

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