mirror of
https://github.com/vector-im/element-ios.git
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369 lines
13 KiB
Swift
Executable file
369 lines
13 KiB
Swift
Executable file
/*
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Copyright 2019 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import UIKit
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import WeakDictionary
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/// `NavigationRouter` is a concrete implementation of NavigationRouterType.
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final class NavigationRouter: NSObject, NavigationRouterType {
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// MARK: - Properties
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// MARK: Private
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private var completions: [UIViewController : () -> Void]
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private let navigationController: UINavigationController
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/// Stores the association between the added Presentable and his view controller.
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/// They can be the same if the controller is not added via his Coordinator or it is a simple UIViewController.
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private var storedModules = WeakDictionary<UIViewController, AnyObject>()
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// MARK: Public
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/// Returns the presentables associated to each view controller
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var modules: [Presentable] {
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return self.viewControllers.map { (viewController) -> Presentable in
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return self.module(for: viewController)
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}
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}
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/// Return the view controllers stack
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var viewControllers: [UIViewController] {
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return navigationController.viewControllers
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}
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// MARK: - Setup
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init(navigationController: UINavigationController = RiotNavigationController()) {
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self.navigationController = navigationController
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self.completions = [:]
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super.init()
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self.navigationController.delegate = self
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// Post local notification on NavigationRouter creation
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let userInfo: [String: Any] = [NavigationRouter.NotificationUserInfoKey.navigationRouter: self,
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NavigationRouter.NotificationUserInfoKey.navigationController: navigationController]
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NotificationCenter.default.post(name: NavigationRouter.didCreate, object: self, userInfo: userInfo)
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}
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deinit {
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// Post local notification on NavigationRouter deinit
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let userInfo: [String: Any] = [NavigationRouter.NotificationUserInfoKey.navigationRouter: self,
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NavigationRouter.NotificationUserInfoKey.navigationController: navigationController]
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NotificationCenter.default.post(name: NavigationRouter.willDestroy, object: self, userInfo: userInfo)
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}
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// MARK: - Public
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func present(_ module: Presentable, animated: Bool = true) {
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MXLog.debug("[NavigationRouter] Present \(module)")
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navigationController.present(module.toPresentable(), animated: animated, completion: nil)
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}
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func dismissModule(animated: Bool = true, completion: (() -> Void)? = nil) {
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MXLog.debug("[NavigationRouter] Dismiss presented module")
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navigationController.dismiss(animated: animated, completion: completion)
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}
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func setRootModule(_ module: Presentable, hideNavigationBar: Bool = false, animated: Bool = false, popCompletion: (() -> Void)? = nil) {
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MXLog.debug("[NavigationRouter] Set root module \(module)")
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let controller = module.toPresentable()
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// Avoid setting a UINavigationController onto stack
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guard controller is UINavigationController == false else {
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MXLog.error("Cannot add a UINavigationController to NavigationRouter")
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return
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}
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self.addModule(module, for: controller)
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let controllersToPop = self.navigationController.viewControllers
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controllersToPop.forEach {
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self.willPopViewController($0)
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}
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if let popCompletion = popCompletion {
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completions[controller] = popCompletion
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}
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self.willPushViewController(controller)
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navigationController.setViewControllers([controller], animated: animated)
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navigationController.isNavigationBarHidden = hideNavigationBar
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self.didPushViewController(controller)
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// Pop old view controllers
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controllersToPop.forEach {
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self.didPopViewController($0)
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}
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}
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func setModules(_ modules: [Presentable], hideNavigationBar: Bool, animated: Bool) {
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MXLog.debug("[NavigationRouter] Set modules \(modules)")
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let controllers = modules.map { (presentable) -> UIViewController in
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let controller = presentable.toPresentable()
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self.addModule(presentable, for: controller)
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return controller
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}
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let controllersToPop = self.navigationController.viewControllers
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controllersToPop.forEach {
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self.willPopViewController($0)
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}
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controllers.forEach {
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self.willPushViewController($0)
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}
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// Set new view controllers
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navigationController.setViewControllers(controllers, animated: animated)
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navigationController.isNavigationBarHidden = hideNavigationBar
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controllers.forEach {
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self.didPushViewController($0)
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}
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// Pop old view controllers
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controllersToPop.forEach {
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self.didPopViewController($0)
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}
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}
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func popToRootModule(animated: Bool) {
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MXLog.debug("[NavigationRouter] Pop to root module")
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let controllers = self.navigationController.viewControllers
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if controllers.count > 1 {
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let controllersToPop = controllers[1..<controllers.count]
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controllersToPop.forEach {
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self.willPopViewController($0)
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}
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}
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if let controllers = navigationController.popToRootViewController(animated: animated) {
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controllers.forEach {
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self.didPopViewController($0)
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}
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}
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}
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func popToModule(_ module: Presentable, animated: Bool) {
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MXLog.debug("[NavigationRouter] Pop to module \(module)")
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let controller = module.toPresentable()
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let controllersBeforePop = self.navigationController.viewControllers
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if let controllerIndex = controllersBeforePop.firstIndex(of: controller) {
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let controllersToPop = controllersBeforePop[controllerIndex..<controllersBeforePop.count]
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controllersToPop.forEach {
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self.willPopViewController($0)
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}
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}
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if let controllers = navigationController.popToViewController(module.toPresentable(), animated: animated) {
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controllers.forEach {
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self.didPopViewController($0)
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}
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}
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}
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func push(_ module: Presentable, animated: Bool = true, popCompletion: (() -> Void)? = nil) {
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MXLog.debug("[NavigationRouter] Push module \(module)")
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let controller = module.toPresentable()
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// Avoid pushing UINavigationController onto stack
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guard controller is UINavigationController == false else {
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MXLog.error("Cannot push a UINavigationController to NavigationRouter")
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return
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}
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self.addModule(module, for: controller)
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if let completion = popCompletion {
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completions[controller] = completion
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}
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self.willPushViewController(controller)
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navigationController.pushViewController(controller, animated: animated)
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self.didPushViewController(controller)
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}
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func popModule(animated: Bool = true) {
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MXLog.debug("[NavigationRouter] Pop module")
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if let lastController = navigationController.viewControllers.last {
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self.willPopViewController(lastController)
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}
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if let controller = navigationController.popViewController(animated: animated) {
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self.didPopViewController(controller)
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}
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}
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func popAllModules(animated: Bool) {
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MXLog.debug("[NavigationRouter] Pop all modules")
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let controllersToPop = self.navigationController.viewControllers
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controllersToPop.forEach {
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self.willPopViewController($0)
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}
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navigationController.setViewControllers([], animated: animated)
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controllersToPop.forEach {
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self.didPopViewController($0)
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}
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}
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func contains(_ module: Presentable) -> Bool {
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let controller = module.toPresentable()
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return self.navigationController.viewControllers.contains(controller)
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}
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// MARK: Presentable
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func toPresentable() -> UIViewController {
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return navigationController
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}
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// MARK: - Private
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private func module(for viewController: UIViewController) -> Presentable {
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guard let module = self.storedModules[viewController] as? Presentable else {
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return viewController
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}
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return module
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}
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private func addModule(_ module: Presentable, for viewController: UIViewController) {
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self.storedModules[viewController] = module as AnyObject
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}
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private func removeModule(for viewController: UIViewController) {
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self.storedModules[viewController] = nil
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}
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private func runCompletion(for controller: UIViewController) {
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guard let completion = completions[controller] else {
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return
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}
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completion()
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completions.removeValue(forKey: controller)
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}
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private func willPushViewController(_ viewController: UIViewController) {
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self.postNotification(withName: NavigationRouter.willPushModule, for: viewController)
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}
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private func didPushViewController(_ viewController: UIViewController) {
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self.postNotification(withName: NavigationRouter.didPushModule, for: viewController)
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}
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private func willPopViewController(_ viewController: UIViewController) {
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self.postNotification(withName: NavigationRouter.willPopModule, for: viewController)
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}
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private func didPopViewController(_ viewController: UIViewController) {
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// Call completion closure associated to the view controller
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// So associated coordinator can be deallocated
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runCompletion(for: viewController)
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self.postNotification(withName: NavigationRouter.didPopModule, for: viewController)
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self.removeModule(for: viewController)
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}
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private func postNotification(withName name: Notification.Name, for viewController: UIViewController) {
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let module = self.module(for: viewController)
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let userInfo: [String: Any] = [
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NotificationUserInfoKey.navigationRouter: self,
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NotificationUserInfoKey.module: module,
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NotificationUserInfoKey.viewController: viewController
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]
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NotificationCenter.default.post(name: name, object: self, userInfo: userInfo)
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}
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}
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// MARK: - UINavigationControllerDelegate
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extension NavigationRouter: UINavigationControllerDelegate {
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func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
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// TODO: Try to post `NavigationRouter.willPopViewController` notification here
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}
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func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
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// Ensure the view controller is popping
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guard let poppedViewController = navigationController.transitionCoordinator?.viewController(forKey: .from),
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!navigationController.viewControllers.contains(poppedViewController) else {
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return
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}
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MXLog.debug("[NavigationRouter] Poppped module: \(poppedViewController)")
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self.didPopViewController(poppedViewController)
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}
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}
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// MARK: - NavigationRouter notification constants
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extension NavigationRouter {
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// MARK: Notification names
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public static let willPushModule = Notification.Name("NavigationRouterWillPushModule")
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public static let didPushModule = Notification.Name("NavigationRouterDidPushModule")
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public static let willPopModule = Notification.Name("NavigationRouterWillPopModule")
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public static let didPopModule = Notification.Name("NavigationRouterDidPopModule")
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public static let didCreate = Notification.Name("NavigationRouterDidCreate")
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public static let willDestroy = Notification.Name("NavigationRouterWillDestroy")
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// MARK: Notification keys
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public struct NotificationUserInfoKey {
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/// The associated view controller (UIViewController).
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static let viewController = "viewController"
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/// The associated module (Presentable), can the view controller itself or is Coordinator
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static let module = "module"
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/// The navigation router that send the notification (NavigationRouterType)
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static let navigationRouter = "navigationRouter"
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/// The navigation controller (UINavigationController) associated to the navigation router
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static let navigationController = "navigationController"
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}
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}
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