Autorotation bug in iOS 13

Question

iOS 13/13.1 autorotation seems to be behave differently than iOS 12. For instance, my app allows user to lock interface orientation to portrait or landscape mode in settings.

1. If I have portrait rotation lock on device and return .landscape in supportedInterfaceOrientations, the interface remains in portrait mode until I disable portrait lock orientation on device. This does not seem to be the case with iOS 12. Infact, supportedInterfaceOrientations is not even called in iOS 13!

2. UIViewController.attemptRotationToDeviceOrientation() also does not work in such cases.

The root of the problem is I temporarily return shouldAutorotate to false while the app is initializing and when everything is initialized, I call UIViewController.attemptRotationToDeviceOrientation() to trigger autorotation. It triggers autorotation in iOS 12 but in iOS 13.1 it doesn't works.

Looks like a bug in iOS 13.1 probably. What do I do to force trigger autorotation?

EDIT: Looks like iOS 12.4.1 also ignores UIViewController.attemptRotationToDeviceOrientation(). There is something broken in autorotation in iOS 12.4.1 & above.

To be clear, this is what I want:

a. Even if portrait lock is set on iPhone, I wish my interface to autorotate to landscape mode if required,

b. UIViewController.attemptRotationToDeviceOrientation() alternative that triggers autorotation in all circumstances.

Answer 1

From iOS 12.4.1, View Controller should be set to Full Screen to respect the auto-rotate orientation.

let vc = UIViewController()
vc.modalPresentationStyle = .fullScreen
self.present(vc, animated: true, completion: nil)