Coordinate alert presentation by integrating it into routing system

ios/MullvadVPN/Classes/AppRoutes.swift

@@ -13,7 +13,7 @@ import UIKit
  Enum type describing groups of routes. Each group is a modal layer with horizontal navigation
  inside with exception where primary navigation is a part of root controller on iPhone.
  */
-enum AppRouteGroup: AppRouteGroupProtocol {
+enum AppRouteGroup: String, AppRouteGroupProtocol {
     /**
      Primary horizontal navigation group.
      */
@@ -39,12 +39,17 @@ enum AppRouteGroup: AppRouteGroupProtocol {
      */
     case changelog
 
+    /**
+     Alert group.
+     */
+    case alert
+
     var isModal: Bool {
         switch self {
         case .primary:
             return UIDevice.current.userInterfaceIdiom == .pad
 
-        case .selectLocation, .account, .settings, .changelog:
+        case .selectLocation, .account, .settings, .changelog, .alert:
             return true
         }
     }
@@ -55,6 +60,9 @@ enum AppRouteGroup: AppRouteGroupProtocol {
             return 0
         case .settings, .account, .selectLocation, .changelog:
             return 1
+        case .alert:
+            // Alerts should always be topmost.
+            return 999
         }
     }
 }
@@ -83,14 +91,19 @@ enum AppRoute: AppRouteProtocol {
      */
     case changelog
 
+    /**
+     Alert route.
+     */
+    case alert(AlertPresentation)
+
     /**
      Routes that are part of primary horizontal navigation group.
      */
     case tos, login, main, revoked, outOfTime, welcome
 
     var isExclusive: Bool {
         switch self {
-        case .selectLocation, .account, .settings, .changelog:
+        case .selectLocation, .account, .settings, .changelog, .alert:
             return true
         default:
             return false
@@ -117,6 +130,8 @@ enum AppRoute: AppRouteProtocol {
             return .account
         case .settings:
             return .settings
+        case .alert:
+            return .alert
         }
     }
 }

ios/MullvadVPN/Coordinators/AccountCoordinator.swift

@@ -23,7 +23,6 @@ enum AddedMoreCreditOption: Equatable {
 final class AccountCoordinator: Coordinator, Presentable, Presenting {
     private let interactor: AccountInteractor
     private var accountController: AccountViewController?
-    private let alertPresenter = AlertPresenter()
 
     let navigationController: UINavigationController
     var presentedViewController: UIViewController {
@@ -49,10 +48,7 @@ final class AccountCoordinator: Coordinator, Presentable, Presenting {
 
         let accountController = AccountViewController(
             interactor: interactor,
-            errorPresenter: PaymentAlertPresenter(
-                presentationController: presentationContext,
-                alertPresenter: alertPresenter
-            )
+            errorPresenter: PaymentAlertPresenter(coordinator: self)
         )
 
         accountController.actionHandler = handleViewControllerAction
@@ -137,19 +133,18 @@ final class AccountCoordinator: Coordinator, Presentable, Presenting {
     // MARK: - Alerts
 
     private func logOut() {
-        let alertController = CustomAlertViewController(icon: .spinner)
+        let presentation = AlertPresentation(icon: .spinner, message: nil, buttons: [])
 
-        alertPresenter.enqueue(alertController, presentingController: presentationContext) {
-            self.interactor.logout {
-                DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(1)) { [weak self] in
-                    guard let self else { return }
+        interactor.logout {
+            DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(1)) { [weak self] in
+                guard let self else { return }
 
-                    alertController.dismiss(animated: true) {
-                        self.didFinish?(self, .userLoggedOut)
-                    }
-                }
+                applicationRouter?.dismiss(.alert(presentation), animated: true)
+                self.didFinish?(self, .userLoggedOut)
             }
         }
+
+        applicationRouter?.present(.alert(presentation))
     }
 
     private func showAccountDeviceInfo() {
@@ -168,21 +163,19 @@ final class AccountCoordinator: Coordinator, Presentable, Presenting {
             comment: ""
         )
 
-        let alertController = CustomAlertViewController(
+        let presentation = AlertPresentation(
             message: message,
-            icon: .info
-        )
-
-        alertController.addAction(
-            title: NSLocalizedString(
-                "DEVICE_INFO_DIALOG_OK_ACTION",
-                tableName: "Account",
-                value: "Got it!",
-                comment: ""
-            ),
-            style: .default
+            buttons: [AlertAction(
+                title: NSLocalizedString(
+                    "DEVICE_INFO_DIALOG_OK_ACTION",
+                    tableName: "Account",
+                    value: "Got it!",
+                    comment: ""
+                ),
+                style: .default
+            )]
         )
 
-        alertPresenter.enqueue(alertController, presentingController: presentationContext)
+        applicationRouter?.present(.alert(presentation), animated: true)
     }
 }

ios/MullvadVPN/Coordinators/AlertCoordinator.swift

@@ -0,0 +1,45 @@
+//
+//  AlertCoordinator.swift
+//  MullvadVPN
+//
+//  Created by Jon Petersson on 2023-08-23.
+//  Copyright © 2023 Mullvad VPN AB. All rights reserved.
+//
+
+import MullvadLogging
+import Routing
+import UIKit
+
+final class AlertCoordinator: Coordinator, Presentable {
+    private var alertController: AlertViewController?
+    private let presentation: AlertPresentation
+
+    var didFinish: (() -> Void)?
+
+    var presentedViewController: UIViewController {
+        return alertController!
+    }
+
+    init(presentation: AlertPresentation) {
+        self.presentation = presentation
+    }
+
+    func start() {
+        let alertController = AlertViewController(
+            header: presentation.header,
+            title: presentation.title,
+            message: presentation.message,
+            icon: presentation.icon
+        )
+
+        self.alertController = alertController
+
+        alertController.onDismiss = { [weak self] in
+            self?.didFinish?()
+        }
+
+        presentation.buttons.forEach { action in
+            alertController.addAction(title: action.title, style: action.style, handler: action.handler)
+        }
+    }
+}

ios/MullvadVPN/Coordinators/ApplicationCoordinator.swift

@@ -23,7 +23,7 @@ final class ApplicationCoordinator: Coordinator, Presenting, RootContainerViewCo
     /**
      Application router.
      */
-    private var router: ApplicationRouter<AppRoute>!
+    private(set) var router: ApplicationRouter<AppRoute>!
 
     /**
      Primary navigation container.
@@ -154,6 +154,9 @@ final class ApplicationCoordinator: Coordinator, Presenting, RootContainerViewCo
 
         case .welcome:
             presentWelcome(animated: animated, completion: completion)
+
+        case let .alert(presentation):
+            presentAlert(presentation: presentation, animated: animated, completion: completion)
         }
     }
 
@@ -162,15 +165,15 @@ final class ApplicationCoordinator: Coordinator, Presenting, RootContainerViewCo
         dismissWithContext context: RouteDismissalContext<RouteType>,
         completion: @escaping () -> Void
     ) {
-        if context.isClosing {
-            let dismissedRoute = context.dismissedRoutes.first!
+        let dismissedRoute = context.dismissedRoutes.first!
 
+        if context.isClosing {
             switch dismissedRoute.route.routeGroup {
             case .primary:
                 endHorizontalFlow(animated: context.isAnimated, completion: completion)
                 context.dismissedRoutes.forEach { $0.coordinator.removeFromParent() }
 
-            case .selectLocation, .account, .settings, .changelog:
+            case .selectLocation, .account, .settings, .changelog, .alert:
                 guard let coordinator = dismissedRoute.coordinator as? Presentable else {
                     completion()
                     return assertionFailure("Expected presentable coordinator for \(dismissedRoute.route)")
@@ -179,13 +182,13 @@ final class ApplicationCoordinator: Coordinator, Presenting, RootContainerViewCo
                 coordinator.dismiss(animated: context.isAnimated, completion: completion)
             }
         } else {
-            let dismissedRoute = context.dismissedRoutes.first!
             assert(context.dismissedRoutes.count == 1)
 
-            if dismissedRoute.route == .outOfTime {
-                guard let coordinator = dismissedRoute.coordinator as? OutOfTimeCoordinator else {
+            switch dismissedRoute.route {
+            case .outOfTime, .welcome:
+                guard let coordinator = dismissedRoute.coordinator as? Poppable else {
                     completion()
-                    return assertionFailure("Unhandled coordinator for \(dismissedRoute.route)")
+                    return assertionFailure("Expected presentable coordinator for \(dismissedRoute.route)")
                 }
 
                 coordinator.popFromNavigationStack(
@@ -194,19 +197,8 @@ final class ApplicationCoordinator: Coordinator, Presenting, RootContainerViewCo
                 )
 
                 coordinator.removeFromParent()
-            } else if dismissedRoute.route == .welcome {
-                guard let coordinator = dismissedRoute.coordinator as? WelcomeCoordinator else {
-                    completion()
-                    return assertionFailure("Unhandled coordinator for \(dismissedRoute.route)")
-                }
 
-                coordinator.popFromNavigationStack(
-                    animated: context.isAnimated,
-                    completion: completion
-                )
-
-                coordinator.removeFromParent()
-            } else {
+            default:
                 assertionFailure("Unhandled dismissal for \(dismissedRoute.route)")
                 completion()
             }
@@ -649,6 +641,24 @@ final class ApplicationCoordinator: Coordinator, Presenting, RootContainerViewCo
         }
     }
 
+    private func presentAlert(
+        presentation: AlertPresentation,
+        animated: Bool,
+        completion: @escaping (Coordinator) -> Void
+    ) {
+        let coordinator = AlertCoordinator(presentation: presentation)
+
+        coordinator.didFinish = { [weak self] in
+            self?.router.dismiss(.alert(presentation))
+        }
+
+        coordinator.start()
+
+        presentChild(coordinator, animated: animated) {
+            completion(coordinator)
+        }
+    }
+
     private func makeTunnelCoordinator() -> TunnelCoordinator {
         let tunnelCoordinator = TunnelCoordinator(tunnelManager: tunnelManager)
 
@@ -982,3 +992,10 @@ fileprivate extension AppPreferencesDataSource {
 
     // swiftlint:disable:next file_length
 }
+
+private protocol Poppable: Presentable {
+    func popFromNavigationStack(
+        animated: Bool,
+        completion: () -> Void
+    )
+}

ios/MullvadVPN/Coordinators/ChangeLogCoordinator.swift

@@ -11,7 +11,7 @@ import Routing
 import UIKit
 
 final class ChangeLogCoordinator: Coordinator, Presentable {
-    private var alertController: CustomAlertViewController?
+    private var alertController: AlertViewController?
     private let interactor: ChangeLogInteractor
     var didFinish: ((ChangeLogCoordinator) -> Void)?
 
@@ -24,7 +24,7 @@ final class ChangeLogCoordinator: Coordinator, Presentable {
     }
 
     func start() {
-        let alertController = CustomAlertViewController(
+        let alertController = AlertViewController(
             header: interactor.viewModel.header,
             title: interactor.viewModel.title,
             attributedMessage: interactor.viewModel.body
@@ -43,6 +43,7 @@ final class ChangeLogCoordinator: Coordinator, Presentable {
                 didFinish?(self)
             }
         )
+
         self.alertController = alertController
     }
 }

ios/MullvadVPN/Coordinators/InAppPurchaseCoordinator.swift

@@ -49,23 +49,27 @@ class InAppPurchaseCoordinator: Coordinator, Presentable {
                 coordinator.start()
 
             case let .failure(failure):
-                let alertController = CustomAlertViewController(
+                let presentation = AlertPresentation(
+                    icon: .alert,
                     message: failure.error.localizedDescription,
-                    icon: .alert
+                    buttons: [
+                        AlertAction(
+                            title: NSLocalizedString(
+                                "IN_APP_PURCHASE_ERROR_DIALOG_OK_ACTION",
+                                tableName: "Welcome",
+                                value: "Got it!",
+                                comment: ""
+                            ),
+                            style: .default,
+                            handler: { [weak self] in
+                                guard let self = self else { return }
+                                self.didCancel?(self)
+                            }
+                        ),
+                    ]
                 )
 
-                alertController.addAction(
-                    title: NSLocalizedString(
-                        "IN_APP_PURCHASE_ERROR_DIALOG_OK_ACTION",
-                        tableName: "Welcome",
-                        value: "Got it!",
-                        comment: ""
-                    ),
-                    style: .default
-                )
-                presentedViewController.present(alertController, animated: true) {
-                    self.didCancel?(self)
-                }
+                applicationRouter?.present(.alert(presentation), animated: true)
             }
         }
     }