bundesmessenger-ios/RiotSwiftUI/Modules/Common/Util/NavigationBarConfigurator.swift

// 
// Copyright 2021 New Vector Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

import SwiftUI

@available(iOS 13.0, *)
extension View {
    func configureNavigationBar(configure: @escaping (UINavigationController) -> Void) -> some View {
        modifier(NavigationConfigurationViewModifier(configure: configure))
    }
}

@available(iOS 13.0.0, *)
struct NavigationConfigurationViewModifier: ViewModifier {
    let configure: (UINavigationController) -> Void

    func body(content: Content) -> some View {
        content.background(NavigationConfigurator(configure: configure))
    }
}

@available(iOS 13.0.0, *)
struct NavigationConfigurator: UIViewControllerRepresentable {
    let configure: (UINavigationController) -> Void

    func makeUIViewController(
        context: UIViewControllerRepresentableContext<NavigationConfigurator>
    ) -> NavigationConfigurationViewController {
        NavigationConfigurationViewController(configure: configure)
    }

    func updateUIViewController(
        _ uiViewController: NavigationConfigurationViewController,
        context: UIViewControllerRepresentableContext<NavigationConfigurator>
    ) { }
}

@available(iOS 13.0.0, *)
final class NavigationConfigurationViewController: UIViewController {
    let configure: (UINavigationController) -> Void

    init(configure: @escaping (UINavigationController) -> Void) {
        self.configure = configure
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()

        if let navigationController = navigationController {
            configure(navigationController)
        }
    }
}