ios: lookup group members via map (#4431)

apps/ios/Shared/Model/ChatModel.swift

@@ -73,6 +73,7 @@ final class ChatModel: ObservableObject {
     var chatItemStatuses: Dictionary<Int64, CIStatus> = [:]
     @Published var chatToTop: String?
     @Published var groupMembers: [GMember] = []
+    @Published var groupMembersIndexes: Dictionary<Int64, Int> = [:] // groupMemberId to index in groupMembers list
     // items in the terminal view
     @Published var showingTerminal = false
     @Published var terminalItems: [TerminalItem] = []
@@ -180,8 +181,18 @@ final class ChatModel: ObservableObject {
         }
     }
 
+    func populateGroupMembersIndexes() {
+        groupMembersIndexes.removeAll()
+        for (i, member) in groupMembers.enumerated() {
+            groupMembersIndexes[member.groupMemberId] = i
+        }
+    }
+
     func getGroupMember(_ groupMemberId: Int64) -> GMember? {
-        groupMembers.first { $0.groupMemberId == groupMemberId }
+        if let i = groupMembersIndexes[groupMemberId] {
+            return groupMembers[i]
+        }
+        return nil
     }
 
     private func getChatIndex(_ id: String) -> Int? {
@@ -667,14 +678,17 @@ final class ChatModel: ObservableObject {
         }
         // update current chat
         if chatId == groupInfo.id {
-            if let i = groupMembers.firstIndex(where: { $0.groupMemberId == member.groupMemberId }) {
+            if let i = groupMembersIndexes[member.groupMemberId] {
                 withAnimation(.default) {
                     self.groupMembers[i].wrapped = member
                     self.groupMembers[i].created = Date.now
                 }
                 return false
             } else {
-                withAnimation { groupMembers.append(GMember(member)) }
+                withAnimation {
+                    groupMembers.append(GMember(member))
+                    groupMembersIndexes[member.groupMemberId] = groupMembers.count - 1
+                }
                 return true
             }
         } else {

apps/ios/Shared/Views/Chat/ChatView.swift

@@ -121,6 +121,7 @@ struct ChatView: View {
                         chatModel.chatItemStatuses = [:]
                         chatModel.reversedChatItems = []
                         chatModel.groupMembers = []
+                        chatModel.groupMembersIndexes.removeAll()
                         membersLoaded = false
                     }
                 }
@@ -255,6 +256,7 @@ struct ChatView: View {
         await MainActor.run {
             if chatModel.chatId == groupInfo.id {
                 chatModel.groupMembers = groupMembers.map { GMember.init($0) }
+                chatModel.populateGroupMembersIndexes()
                 membersLoaded = true
                 updateView()
             }

apps/ios/Shared/Views/Chat/Group/GroupChatInfoView.swift

@@ -207,6 +207,7 @@ struct GroupChatInfoView: View {
                         let groupMembers = await apiListMembers(groupInfo.groupId)
                         await MainActor.run {
                             chatModel.groupMembers = groupMembers.map { GMember.init($0) }
+                            chatModel.populateGroupMembersIndexes()
                         }
                     }
                 }

apps/ios/Shared/Views/NewChat/AddGroupView.swift

@@ -194,6 +194,7 @@ struct AddGroupView: View {
                 let groupMembers = await apiListMembers(gInfo.groupId)
                 await MainActor.run {
                     m.groupMembers = groupMembers.map { GMember.init($0) }
+                    m.populateGroupMembersIndexes()
                 }
             }
             let c = Chat(chatInfo: .group(groupInfo: gInfo), chatItems: [])