View unusable after dismissViewControllerAnimated:completion:
autolayout, uiviewcontroller
Solution
I was setting `translatesAutoresizingMaskIntoConstraints = NO;` on my root `UIView`. It appears the "outermost" `UIView` — the superview at the root of your view hierarchy must use the default `translatesAutoresizingMaskIntoConstraints = YES`. Once I've removed this, everything worked as expected.
Problem
I'm migrating older code that used NIBs to use manual view creation (`loadView`) and Auto Layout. The root view controller is a container VC (with 2 children) that uses auto layout and modally presents a view controller that has its layout specified in a NIB and does not yet use auto layout. All is fine after `presentViewController:animated:completion:`, but when the modal view is closed with `dismissViewControllerAnimated:completion:` via delegate call, the presenting view is left in a strange, unusable state where the content is weirdly shifted and does not react to touch. I have tried to create minimal test case to reproduce the problem, but I've failed to reproduce the issue. What could be causing this?