What is the proper way to change rowHeight? (possibly animate?)

Question

What is the proper way to change rowHeight for UITableView? I set tableView.rowHeight and do a [tableView reloadData]. Is this necessary? Also, is it possible to animate the height change? It is not a standard transition.

Answer 1

Not a perfect solution for your animation question - but....
in the function where you want to change the height
WARNING PSUDO CODE
//indexPath is the path for theCell you want to edit
thePlaceThatYouStoreYourHeights[x] = aNewHeight;
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationTop];
and inside of - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath (NSIndexPath *)indexPath
return thePlaceThatYouStoreYourHeights[indexPath.row];
Basic flow
1. Store new desired height somewhere
2. Remove the cell deleteRowsAtIndexPaths
3. UITableView paints the animation for the "remove" transition **see note
4. Re-add the cell insertRowsAtIndexPaths (which subsequently kicks of a call to heightForRowAtIndexPath before animating)
5. UITableView paints the animation for the "add" transition
You do NOT need to call reloadData to get this to work.
**note: an enum such as UITableViewRowAnimationNone does not exist (it should but it doesnt seem to). the docs for InsertRowsAtIndexPaths say "A constant that either specifies the kind of animation to perform when inserting the cell or requests no animation." however there are only 5 items in the UITableViewRowAnimation enum and UITableViewRowAnimationFade resolves to 0 - so passing NO will actually get you fade. Nor will it take nil.
Hope this helps shed some light.