Regression with additionalSafeAreaInsets in iOS 12.1 beta

Originator:marksands07
Number:rdar://45327266 Date Originated:October 16 2018
Status:Open Resolved:
Product:UIKit Product Version:iOS 12.1 beta
Classification:Serious Bug Reproducible:Always
 
Summary:

We are seeing a regression in iOS 12.1 beta when setting the additionalSafeAreaInsets for a navigation controller subclass. The navigation controller has a custom TabBar class backed by a toolbar. When additionalSafeAreaInsets are set, the tabBar items are offset outside of the tappable area.

Steps to Reproduce:

See attached sample project.

Expected Results:

No regression.

Actual Results:

Regression.

Sample Project: https://github.com/marksands/radars/tree/master/45327266

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