SwiftUI hack: NavigationView and TabView's appearance

SwiftUINavViewTabViewAppearance.swift

// SwiftUI hack: NavigationView and TabView's appearance

import UIkit

extension UINavigationController {
    override open func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        let appearance = UINavigationBarAppearance()
        appearance.configureWithOpaqueBackground()
        navigationBar.standardAppearance = appearance
        navigationBar.compactAppearance = appearance
        navigationBar.scrollEdgeAppearance = appearance
    }
}

extension UITabBarController {
    override open func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        let appearance = UITabBarAppearance()
        appearance.configureWithOpaqueBackground()
        tabBar.standardAppearance = appearance
    }
}