Merely accessing the presentationController changes program flow and breaks rotation.

Originator:steipete
Number:rdar://19096083 Date Originated:29-Nov-2014 09:01 PM
Status:Closed Resolved:
Product:iOS Product Version:8.1.1
Classification:UI/Usability Reproducible:Always
 
Summary:
Merely accessing the presentationController changes program flow and breaks rotation.

Steps to Reproduce:
Open sample, press “show modal”. Observe that it is presented in portrait, even though we have preferredInterfaceOrientationForPresentation overridden to UIInterfaceOrientationLandscapeLeft.

Change the program and comment out the single [navController presentationController];, run again and observe that everything’s working as expected now.

Expected Results:
Accessing a getter should not have side effects. preferredInterfaceOrientationForPresentation should always be honored.

Actual Results:
Accessing a getter has side effects, calls  -[UIViewController _setTemporaryPresentationController:], and later on runs through different code paths in -[UIViewController _presentViewController:withAnimationController:completion:] (which doesn’t re-set the modalPresentationStyle) and then ultimately doesn’t query the preferred rotation in _preferredInterfaceOrientationForPresentationInWindow:fromInterfaceOrientation.

Regression:
This API didn’t exist in iOS 7.

Notes:
Tracking down this bug was quite a lot of fun :)

Comments

Fixed in iOS 10b1

By steipete at June 20, 2016, 4:54 p.m. (reply...)

Example: http://cl.ly/2C0w0n0d2z0f

Fixed in PSPDFKit 4.2.0

By steipete at Nov. 29, 2014, 8:03 p.m. (reply...)

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