style archived chats cell (#197)

deltachat-ios/Controller/ChatListController.swift

@@ -98,6 +98,11 @@ class ChatListController: UIViewController {
         coordinator?.showNewChatController()
     }
 
+    private func getNumberOfArchivedChats() -> Int {
+        let chatList = dcContext.getChatlist(flags: DC_GCL_ARCHIVED_ONLY, queryString: nil, queryId: 0)
+        return chatList.length
+    }
+
     private func getChatList() {
         var gclFlags: Int32 = 0
         if showArchive {
@@ -123,6 +128,11 @@ extension ChatListController: UITableViewDataSource, UITableViewDelegate {
             fatalError("chatList was nil in data source")
         }
 
+        let chatId = chatList.getChatId(index: row)
+        if chatId == DC_CHAT_ID_ARCHIVED_LINK {
+            return getArchiveCell(tableView)
+        }
+
         let cell: ContactCell
         if let c = tableView.dequeueReusableCell(withIdentifier: "ChatCell") as? ContactCell {
             cell = c
@@ -130,7 +140,6 @@ extension ChatListController: UITableViewDataSource, UITableViewDelegate {
             cell = ContactCell(style: .default, reuseIdentifier: "ChatCell")
         }
 
-        let chatId = chatList.getChatId(index: row)
         let chat = DcChat(id: chatId)
         let summary = chatList.getSummary(index: row)
 
@@ -200,6 +209,22 @@ extension ChatListController: UITableViewDataSource, UITableViewDelegate {
         return [archive, delete]
     }
 
+    func getArchiveCell(_ tableView: UITableView) -> UITableViewCell {
+        let archiveCell: UITableViewCell
+        if let cell = tableView.dequeueReusableCell(withIdentifier: "ArchiveCell") {
+            archiveCell = cell
+        } else {
+            archiveCell = UITableViewCell(style: .default, reuseIdentifier: "ArchiveCell")
+        }
+        archiveCell.textLabel?.textAlignment = .center
+        var title = String.localized("chat_archived_chats_title")
+        let count = getNumberOfArchivedChats()
+        title.append(" (\(count))")
+        archiveCell.textLabel?.text = title
+        archiveCell.textLabel?.textColor = .systemBlue
+        return archiveCell
+    }
+
     private func showDeleteChatConfirmationAlert(chatId: Int) {
         let alert = UIAlertController(
             title: nil,