Open Radar

 
Summary:
When presenting a QLPreviewController in a Navigation Controller, the display is clear as it presents the QL content, if the navigation controller itself was presented.

See the attached sample project and video.

Imagine that the first VC is some form of login/authentication controller.  Upon successful authentication the Navigation controller is presented modally allow the user to access the applications content.  Clicking on the button, initiates a QLPreviewController - however as it animates on screen the incoming content is clear.  Once the animation has completed, the preview content pops and suddenly displays.

If you set the root view controller in the storyboard to be the navigation controller directly the QLPreviewController displays as expected.

Steps to Reproduce:
Open attached project.
Run
Click Login button
Click Present QL from this VC
Notice incorrect rendering
Open main.storyboard - make the NavigationController the root VC
Re-run. Notice QLPreviewController animates into place correctly.

Expected Results:
QLPreviewController animates onto the screen correctly.

Actual Results:
QLPreviewController content is not rendered until animation completes

Version:
iOS Simulator Version 8.1 (550.3)