scrollToRowAtIndexPath:atScrollPosition:animated: is broken when using estimatedRowHeight

Number:rdar://20829131 Date Originated:05-May-2015 05:15 PM
Status:Open Resolved:
Product:iOS SDK Product Version:8.3
Classification:UI/Usability Reproducible:Always
If a tableView uses estimatedRowHeight, scrollToRowAtIndexPath:atScrollPosition:animated will not scroll to the correct location in the tableview.

Steps to Reproduce:
1. Create a table with lots of cells. 
2. Provide an `estimatedRowHeight`
3. Implement `tableView:heightForRowAtIndexPath:` and return a different value than `estimatedRowHeight`
4. Call `scrollToRowAtIndexPath:atScrollPosition:animated` to go to the last cell

Expected Results:
You should now be at the bottom of the table.

Actual Results:

If the total for all estimated heights is > actual heights, we zoom past the end and get a blank screen. If the total for all estimated heights is < actual heights, we don't reach the end — the scroller is not 100% of the way.
The results differ between `animated` being YES or NO, but neither behaviour correct puts the cell onscreen.


Duplicated radar was closed, so I resubmitted

By padraig.kennedy at July 8, 2015, 11:37 p.m. (reply...)

Engineering has determined that your bug report (20829131) is a duplicate of another issue (15283329) and will be closed.

By padraig.kennedy at May 20, 2015, 11:40 p.m. (reply...)

Test project here:

By padraig.kennedy at May 6, 2015, 12:42 a.m. (reply...)

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