Navigate to topic from notification tap

docs/GETTING_STARTED.md

@@ -54,4 +54,6 @@ Note: these requirements are strictly based off of my development on this app. T
 - https://stackoverflow.com/a/41783666/1440785
 - https://stackoverflow.com/questions/47374903/viewing-core-data-data-from-your-app-on-a-device
 - https://debashishdas3100.medium.com/save-push-notifications-to-coredata-userdefaults-ios-swift-5-ea074390b57
-- https://cocoacasts.com/cocoa-fundamentals-how-to-access-builds-settings-in-swift
+- https://cocoacasts.com/cocoa-fundamentals-how-to-access-builds-settings-in-swifti
+- https://www.hackingwithswift.com/articles/216/complete-guide-to-navigationview-in-swiftui
+- https://stackoverflow.com/a/70731861/1440785

ntfy/App/AppDelegate.swift

@@ -5,9 +5,12 @@ import Firebase
 import FirebaseCore
 import CoreData
 
-class AppDelegate: UIResponder, UIApplicationDelegate {
+class AppDelegate: UIResponder, UIApplicationDelegate, ObservableObject {
     let tag = "AppDelegate"
     
+    // Implements navigation from notifications, see https://stackoverflow.com/a/70731861/1440785
+    @Published var selectedBaseUrl: String? = nil
+
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         Log.d(tag, "Launching AppDelegate")
         
@@ -61,7 +64,11 @@ extension AppDelegate: UNUserNotificationCenterDelegate {
     ) {
         let userInfo = response.notification.request.content.userInfo
         Log.d(tag, "Notification received via userNotificationCenter(didReceive)", userInfo)
-        // TODO: This should navigate to the detail view
+        
+        if let topic = userInfo["topic"] as? String {
+           selectedBaseUrl = topicUrl(baseUrl: Config.appBaseUrl, topic: topic)
+        }
+    
         completionHandler()
     }
 }

ntfy/App/AppMain.swift

@@ -34,6 +34,7 @@ struct AppMain: App {
             ContentView()
                 .environment(\.managedObjectContext, store.context)
                 .environmentObject(store)
+                .environmentObject(delegate)
                 .onReceive(NotificationCenter.default.publisher(for: UIApplication.didBecomeActiveNotification)) { _ in
                     // Use this hook instead of applicationDidBecomeActive, see https://stackoverflow.com/a/68888509/1440785
                     // That post also explains how to start SwiftUI from AppDelegate if that's ever needed.

ntfy/Views/NotificationListView.swift

@@ -7,7 +7,7 @@ enum ActiveAlert {
 struct NotificationListView: View {
     private let tag = "NotificationListView"
     
-    @Environment(\.presentationMode) var presentationMode
+    @EnvironmentObject private var delegate: AppDelegate
     @EnvironmentObject private var store: Store
     
     @ObservedObject var subscription: Subscription
@@ -31,8 +31,22 @@ struct NotificationListView: View {
         .listStyle(PlainListStyle())
         .navigationBarTitleDisplayMode(.inline)
         .environment(\.editMode, self.$editMode)
-        .navigationBarBackButtonHidden(self.editMode == .active)
+        .navigationBarBackButtonHidden(true)
         .toolbar {
+            ToolbarItem(placement: .navigationBarLeading) {
+                if (self.editMode != .active) {
+                    Button(action: {
+                        // iOS bug (?): We create a custom back button, because when we return using the original
+                        // back button, and the navigation is popped that way, the row stays highlighted for a long
+                        // time, which is weird and feels wrong. This avoids that behavior.
+                        
+                        self.delegate.selectedBaseUrl = nil
+                    }){
+                        Image(systemName: "chevron.left")
+                    }
+                    .padding([.top, .bottom, .trailing], 20)
+                }
+            }
             ToolbarItem(placement: .principal) {
                 Text(subscription.displayName()).font(.headline)
             }
@@ -59,6 +73,7 @@ struct NotificationListView: View {
                         }
                     } label: {
                         Image(systemName: "ellipsis.circle")
+                            .padding([.top, .bottom, .leading], 20)
                     }
                 }
             }
@@ -161,7 +176,7 @@ struct NotificationListView: View {
         DispatchQueue.global(qos: .background).async {
             subscriptionManager.unsubscribe(subscription)
         }
-        presentationMode.wrappedValue.dismiss()
+        delegate.selectedBaseUrl = nil
     }
     
     private func deleteAll() {

ntfy/Views/SubscriptionListView.swift

@@ -55,6 +55,7 @@ struct SubscriptionListView: View {
 
 struct SubscriptionItemNavView: View {
     @EnvironmentObject private var store: Store
+    @EnvironmentObject private var delegate: AppDelegate
     @ObservedObject var subscription: Subscription
     @State private var unsubscribeAlert = false
     
@@ -64,7 +65,11 @@ struct SubscriptionItemNavView: View {
     
     var body: some View {
         ZStack {
-            NavigationLink(destination: NotificationListView(subscription: subscription)) {
+            NavigationLink(
+                destination: NotificationListView(subscription: subscription),
+                tag: subscription.urlString(),
+                selection: $delegate.selectedBaseUrl
+            ) {
                 EmptyView()
             }
             .opacity(0.0)