//一个section刷新

NSIndexSet *indexSetA = [[NSIndexSet alloc]initWithIndex:3];    //刷新第3段

[tableview reloadSections:indexSetA withRowAnimation:UITableViewRowAnimationAutomatic];

//一个cell刷新

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

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