Keep uitableview static when inserting rows at the top

Question

I have a tableView that I\'m inserting rows into at the top.

Whilst I\'m doing this I want the current view to stay completely still, so the rows only appear if you

Answer 1

had the same problem and found a solution.

    save tableView currentOffset. (Underlying scrollView method)
    //Add rows (beginUpdates,insert...,endUpdates) // don't do this!
    reloadData ( to force a recalulation of the scrollview size )
    add newly inserted row heights to contentOffset.y here, using tableView:heightForRowAtIndexPath:
    setContentOffset (Underlying scrollview method)

like this:

- (CGFloat) firstRowHeight
{
    return [self tableView:[self tableView] heightForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
}

...
CGPoint offset = [[self tableView] contentOffset];
[self tableView] reloadData];
offset.y += [self firstRowHeight];
if (offset.y > [[self tableView] contentSize].height) {
    offset.y = 0;
}
[[self tableView] setContentOffset:offset];
...

works perfectly, without glitches.