指定某个 cell 刷新某个cell数据

• 指定某个 cell

 UITableViewCell *cell = [weakSelf.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:3 inSection:0]]; 

• 刷新某个cell数据

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

• 刷新某一个section刷新

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