Open Radar

 
Summary:
When navigating away from a view with a long scrollview with direct subviews of that scrollview, then returning to it, the view will offset its contents by 1/2 the contentOffset property on Retina devices, and the full contentOffset on non-retina devices. 

Steps to Reproduce: 
- Create a view using autolayout with a scrollview that is longer than the screen. 
- Scroll down a bit. 
- Move to a new view controller. 
- Go back to initial view controller, note that your views are all now offset by 1/2 the amount 

Expected Results:
- Returning to a view will not cause its contents to offset even if using direct subviews of a scrollview

Actual Results:
- Contents are offset in an unacceptable and unexpected fashion. 


Regression:
This behavior was not present prior to the introduction of AutoLayout. 

Notes:
This behavior does not occur if using a containing UIView for your scrollView Subviews.

This is happening somewhere between when viewWillAppear and viewDidLayoutSubviews are called in the ViewController. If we save the content offset  to a property in viewWillAppear: then reset it to CGPointZero, then in viewDidLayoutSubviews put it back to the previous offset, the view behaves as expected. 

I included a sample project that reproduces this behavior and has a block of code you can uncomment to see the workaround. [Openradar note: email designated nerd at gmail dot com if you want a copy]


[NOTE: 5/28/13: Just received an email from Apple informing me this is being closed as a dupe and is being tracked under bug #12523345 - file more dupes if you want them to fix it!]