iOS 11: Pushing/Popping scrollView on navController with opaque navBar visibly adjusts content during transition

Number:rdar://34465226 Date Originated:2017-09-15
Status:Open Resolved:
Product:iOS + SDK Product Version:iOS 11
Classification:Bug Reproducible:Always

When pushing a view controller that contains a scroll or tableView onto a navigation controller with an opaque navBar, the content of the scroll or tableView is visibly adjusted during the transition. It starts out about 20 points too low, and moves up 20 points during the transition. The final position of the content is correct.
If the navBar is translucent, the behavior doesn't occur.
If UIScrollView.contentInsetAdjustmentBehavior is set to .never, the behavior doesn't occur.
I verified this in the simulator as well as a physical device.

Steps to Reproduce:
See attached projects and videos.

Expected Results:
Content should not move inside scroll or tableView during transition.

Actual Results:
Content moves up about 20 points during transition, and ends up in the correct place.

Xcode 9 GM, iOS 11 Simulator, iOS 11 GM


I can reproduce the bug for iOS 11.1 but it seems that the bug is fixed since iOS 11.2.

By linda.werner at Dec. 11, 2017, 2:52 p.m. (reply...)

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