modalPresentationStyle formSheet issues on iphone XR, XS Max

Question

I am displaying modal UIViewController with modalPresentationStyle = .formSheet but it has some issues on iphone XR and XS Max. It's displayed behind notch. Image bellow from left side iphone XR, XS, X.

UIViewController use autolayout and is presented like this:

let contentViewController = UINib(nibName: "EditViewController", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! EditViewController

let navController = UINavigationController(rootViewController: contentViewController)

navController.modalPresentationStyle = UIModalPresentationStyle.formSheet
let popover = navController.presentationController!
popover.delegate = self

self.present(navController, animated: true, completion: nil)

delegate:

extension MyController: UIAdaptivePresentationControllerDelegate {

    func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
        return .none
    }
}

There is same issue with modalPresentationStyle = .pageSheet. It works fine with other modalPresentationStyles ie fullscreen

It's on iOS 12.1, swift 3

Any idea how to fix this? Thanks

Tinhorn

I think you should report this one to apple. – Infiltration

Answer 1

UIKit does not support that.

The only possibilities are sheet to full screen and page sheet to form sheet on iPad. As specified in the documentation :

In a horizontally compact environment, this option behaves the same as UIModalPresentationFullScreen.

So UIKit already adapts it.

Unfortunately you will have to implement your own custom transition controller.

Belak

what do you mean by UIKit does not support that? I just want to fix this issue with sheet behind notch which is only on XR – Tinhorn

If I understood your problem correctly, you're trying to use formSheet in a compact environment. UIKit does not support it. This is worst on smaller devices. – Danyelldanyelle

Answer 2

As GaétanZ said, better use another modal presentation style like overFullScreen for compact horizontal size clases and leave the formSheet for the horizontally regular ones.

func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
    if controller.traitCollection.horizontalSizeClass == .regular {
        return .formSheet
    }
    return .overFullScreen
 }

Mathildamathilde