Question

When I’m getting new data from my server I need to:

1. update existing data for the existing rows of UITableView and
2. insert new rows with animation.

The thing is I don’t know when [UITableView reloadData] is finished for step 1,
so I can start step 2.

How to deal with this situation?

I prefer to use step 1 with [UITableView reloadData] for simplicity, but any other solution to achieve both steps in one logic step will be cool too.

UPDATE – maybe this is my mistake.

it’s seems that

-update data model with existing rows info

-reloadData

-update data model with new rows info

-insertWorsAtIndexPaths

works O.K now.

I removed some “ugly” way that force main thread to refresh after step 1, and for now, everything is O.K

(the “ugly way was calling [NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.0f] , that for some reason I need to add it to work in the past)

Wonder..if everything really O.K now.
Will Update if somthing still wrong.
Sorry for the troubles 🙂

update 2

this is how now I use it and seems to work ok :

-update existing rows in data model, then call

[UITableView reloadData];

-add new rows to data model, then call

[UITableView beginUpdates]

[UITableView insertRowsAtIndexPath withRowAnimation]

[UITableView endUpdates]

Answer 1

You could use reloadSections:withRowAnimation: to update your rows with an animation. Or you can use reloadData then insertRowsAtIndexPaths:withRowAnimation: it depends how do you get the data.

Check the UITableView Reference