ios: enable swipe to go back from chat to list (#1824)

* ios: Testing workaround of a crash

* another try

* complete

* added file

* enable swipe to go back from ChatView

* Revert "enable swipe to go back from ChatView"

This reverts commit 22de79505c.

* ios: enable swipe to go back from ChatView

* remove title change

* remove unused

* remove unused variable

Co-authored-by: Evgeny Poberezkin <2769109+epoberezkin@users.noreply.github.com>

apps/ios/Shared/Model/SimpleXAPI.swift

@@ -946,7 +946,6 @@ func startChat() throws {
 }
 
 func changeActiveUser(_ userId: Int64) {
-    let m = ChatModel.shared
     do {
         try changeActiveUser_(userId)
     } catch let error {

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

@@ -63,7 +63,6 @@ struct ChatView: View {
         .padding(.top, 1)
         .navigationTitle(cInfo.chatViewName)
         .navigationBarTitleDisplayMode(.inline)
-        .navigationBarBackButtonHidden(true)
         .onAppear {
             if chat.chatStats.unreadChat {
                 Task {
@@ -71,25 +70,20 @@ struct ChatView: View {
                 }
             }
         }
-         .onChange(of: chatModel.chatId) { _ in
-             if chatModel.chatId == nil { dismiss() }
-         }
-        .toolbar {
-            ToolbarItem(placement: .navigationBarLeading) {
-                Button {
-                    chatModel.chatId = nil
-                    DispatchQueue.main.asyncAfter(deadline: .now() + 0.35) {
-                        if chatModel.chatId == nil {
-                            chatModel.reversedChatItems = []
-                        }
-                    }
-                } label: {
-                    HStack(spacing: 0) {
-                        Image(systemName: "chevron.backward")
-                        Text("Chats")
+        .onChange(of: chatModel.chatId) { _ in
+            if chatModel.chatId == nil { dismiss() }
+        }
+        .onDisappear {
+            if chatModel.chatId == cInfo.id {
+                chatModel.chatId = nil
+                DispatchQueue.main.asyncAfter(deadline: .now() + 0.35) {
+                    if chatModel.chatId == nil {
+                        chatModel.reversedChatItems = []
                     }
                 }
             }
+        }
+        .toolbar {
             ToolbarItem(placement: .principal) {
                 if case let .direct(contact) = cInfo {
                     Button {

apps/ios/Shared/Views/ChatList/ChatListView.swift

@@ -102,6 +102,8 @@ struct ChatListView: View {
                         }
                         Image(systemName: "theatermasks").frame(maxWidth: 24, maxHeight: 24, alignment: .center).foregroundColor(.indigo)
                     }
+                } else {
+                    Text("Your chats").font(.headline)
                 }
             }
             ToolbarItem(placement: .navigationBarTrailing) {