[iOS] Create public space #143

- Initial space creation flow

RiotSwiftUI/Modules/Common/Util/NavigationBarConfigurator.swift

@@ -0,0 +1,71 @@
+// 
+// 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)
+        }
+    }
+}