UINavigationController by default doesn't forward user interface orientation callbacks to its child view controllers. This is a workaround.

MindfulNavigationController.swift

import UIKit

final class MindfulNavigationController: UINavigationController {
    /// Forward user interface orientation callbacks to top view controller.
    var respectsTopViewControllerOrientationConfiguration = true

    override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
        guard respectsTopViewControllerOrientationConfiguration,
            let topViewController = topViewController else
        {
            return super.supportedInterfaceOrientations()
        }
        return topViewController.supportedInterfaceOrientations()
    }
}