[Swift]NavigationBarの下線の消し方（iOS13以降）

extension.swift

extension UINavigationBar {
    @available(iOS 13.0, *)
    private func applyAppearance() {
        let appearance = UINavigationBarAppearance()
        appearance.configureWithDefaultBackground()
        appearance.shadowImage = UIImage()
        appearance.shadowColor = .clear
        appearance.backgroundImage = UIImage()
        appearance.backgroundColor = .white

        standardAppearance = appearance
        scrollEdgeAppearance = appearance
    }
}

これで消せます。