iOS 刷新tableView 的某一组cell或者某一行cell

//一个section刷新    

NSIndexSet *indexSetTT = [[NSIndexSet alloc]initWithIndex:2];    //刷新第2组

[tableview reloadSections:indexSetTT withRowAnimation:UITableViewRowAnimationAutomatic];    

 

//一个cell刷新    

NSIndexPath *indexPathTT = [NSIndexPath indexPathForRow:2 inSection:0]; //刷新第0段第2行

[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPathTT,nil] withRowAnimation:UITableViewRowAnimationNone];