ios: notification badge count (#822)

apps/ios/Shared/Model/ChatModel.swift

@@ -127,6 +127,7 @@ final class ChatModel: ObservableObject {
                 addChat(Chat(c), at: i)
             }
         }
+        NtfManager.shared.setNtfBadgeCount(totalUnreadCount())
     }
 
 //    func addGroup(_ group: SimpleXChat.Group) {
@@ -139,6 +140,7 @@ final class ChatModel: ObservableObject {
             chats[i].chatItems = [cItem]
             if case .rcvNew = cItem.meta.itemStatus {
                 chats[i].chatStats.unreadCount = chats[i].chatStats.unreadCount + 1
+                NtfManager.shared.incNtfBadgeCount()
             }
             if i > 0 {
                 if chatId == nil {
@@ -203,6 +205,9 @@ final class ChatModel: ObservableObject {
         // remove from current chat
         if chatId == cInfo.id {
             if let i = chatItems.firstIndex(where: { $0.id == cItem.id }) {
+                if chatItems[i].isRcvNew() == true {
+                    NtfManager.shared.decNtfBadgeCount()
+                }
                 _ = withAnimation {
                     self.chatItems.remove(at: i)
                 }
@@ -213,6 +218,7 @@ final class ChatModel: ObservableObject {
     func markChatItemsRead(_ cInfo: ChatInfo) {
         // update preview
         if let chat = getChat(cInfo.id) {
+            NtfManager.shared.decNtfBadgeCount(by: chat.chatStats.unreadCount)
             chat.chatStats = ChatStats()
         }
         // update current chat
@@ -230,6 +236,7 @@ final class ChatModel: ObservableObject {
     func clearChat(_ cInfo: ChatInfo) {
         // clear preview
         if let chat = getChat(cInfo.id) {
+            NtfManager.shared.decNtfBadgeCount(by: chat.chatStats.unreadCount)
             chat.chatItems = []
             chat.chatStats = ChatStats()
             chat.chatInfo = cInfo
@@ -251,6 +258,10 @@ final class ChatModel: ObservableObject {
         }
     }
 
+    func totalUnreadCount() -> Int {
+        chats.reduce(0, { count, chat in count + chat.chatStats.unreadCount })
+    }
+
     func getPrevChatItem(_ ci: ChatItem) -> ChatItem? {
         if let i = chatItems.firstIndex(where: { $0.id == ci.id }), i > 0  {
             return chatItems[i - 1]

apps/ios/Shared/Model/NtfManager.swift

@@ -188,6 +188,19 @@ class NtfManager: NSObject, UNUserNotificationCenterDelegate, ObservableObject {
         addNotification(createCallInvitationNtf(invitation))
     }
 
+    func setNtfBadgeCount(_ count: Int) {
+        UIApplication.shared.applicationIconBadgeNumber = count
+        ntfBadgeCountGroupDefault.set(count)
+    }
+
+    func decNtfBadgeCount(by count: Int = 1) {
+        setNtfBadgeCount(max(0, UIApplication.shared.applicationIconBadgeNumber - count))
+    }
+
+    func incNtfBadgeCount(by count: Int = 1) {
+        setNtfBadgeCount(UIApplication.shared.applicationIconBadgeNumber + count)
+    }
+
     private func addNotification(_ content: UNMutableNotificationContent) {
         if !granted { return }
         let trigger = UNTimeIntervalNotificationTrigger(timeInterval: ntfTimeInterval, repeats: false)

apps/ios/Shared/Model/SimpleXAPI.swift

@@ -594,6 +594,7 @@ func startChat() throws {
         m.userSMPServers = try getUserSMPServers()
         let chats = try apiGetChats()
         m.chats = chats.map { Chat.init($0) }
+        NtfManager.shared.setNtfBadgeCount(m.totalUnreadCount())
         try refreshCallInvitations()
         (m.savedToken, m.tokenStatus, m.notificationMode) = apiGetNtfToken()
         if let token = m.deviceToken {