iOS 9 regression: UITableView section background is white when visibleCells is called at the wrong time.
| Originator: | steipete | ||
| Number: | rdar://23904182 | Date Originated: | 15-Dec-2015 08:05 PM |
| Status: | Open | Resolved: | |
| Product: | iOS | Product Version: | 9.1 |
| Classification: | Other Bug | Reproducible: | Always |
Summary: UITableView section background is white when visibleCells is called at the wrong time (namely in viewWillAppear:). This took me a while to track down. It’s a regression that appeared first on iOS 9.0. 8.3/8.4 work as expected (haven’t tested earlier versions but this never popped up so I assume is’s really a new bug in iOS 9) We update visible cells in viewWillAppear: instead of calling reloadData to improve performance and keep the selection intact. As soon as we call `visibleCells` or any of the related API (indexPathsForVisibleRows or cellForRowAtIndexPath) then under certain conditions UIKit reloads views: https://twitter.com/steipete/status/676832422902763520 This was the original bug: https://twitter.com/steipete/status/676818752630059008 This is how things should look: http://cl.ly/2H1j253r3H2A Steps to Reproduce: See example. Uncomment the call to visibleCells to work around the issue. Expected Results: The cell section background color should not change depending on when we query cells.
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