UIScrollView zooming with auto layout is completely broken in iOS 12 beta 1

Originator:michaelab1
Number:rdar://41125342 Date Originated:June 14th 2018
Status:Open Resolved:
Product:iOS + SDK Product Version:iOS 12.0 (16A5288q)
Classification:Serious Bug Reproducible:Always
 
Area:
UIKit

Summary:
A zooming UIScrollView with a UIImageView subview constrained to the edges of the scroll view using auto layout does not work when the image is larger than the UIScrollView. 
This works fine in iOS 11.4 but is broken in iOS 12 beta 1

I have a demo project which reproduces the issue every time:
https://github.com/mluisbrown/ZoomTest

Steps to Reproduce:
Create a UIScrollView, add a UIImageView, with an image larger than the scrollview, as a subview, pinning its edges to the edges of the scroll view using auto layout constraints.

Expected Results:
The image should be displayed, and it should be possible to zoom and pan the image.

Actual Results:
The image is not visible at all.

Version/Build:
iOS 12.0 (16A5288q)
Xcode 10 beta (10L176w)

Configuration:

Comments


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