Why is the top layout guide moving in my iMessage extension

Question

I have an iMessage extension and I\'m having some issues with the top layout guide. I have an MSMessagesAppViewController that handles changes between presentation

Answer 1

I used a slightly varied version of Andrey's

class MyViewController: MSMessagesAppViewController {
    private func presentModalViewController() {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = .savedPhotosAlbum
        imagePicker.modalPresentationStyle = .custom
        imagePicker.transitioningDelegate = self
        present(
            imagePicker,
            animated: true,
            completion: nil
        )
    }
}

extension MyViewController: UIViewControllerTransitioningDelegate {
    func presentationController(
         forPresented presented: UIViewController,
         presenting: UIViewController?,
         source: UIViewController
    ) -> UIPresentationController? {
         let vc = PresentationController(
             presentedViewController: presented,
             presenting: presenting
         )
         vc.framePresented = modalBoundaries.frame
         return vc
    }
}

class PresentationController: UIPresentationController {
     var framePresented = CGRect.zero
     override var frameOfPresentedViewInContainerView: CGRect {
         return framePresented
    }
}

modalBoundaries being a dummy UIView constrained (via XIB in my case) to respect any TopLayoutGuide length.