update ContactDetailViewController on incoming messages or contact change event

deltachat-ios/Controller/ContactDetailViewController.swift

@@ -95,6 +95,9 @@ class ContactDetailViewController: UITableViewController {
         return cell
     }()
 
+    private var incomingMsgsObserver: NSObjectProtocol?
+    private var contactChangedObserver: NSObjectProtocol?
+
     init(dcContext: DcContext, contactId: Int) {
         self.viewModel = ContactDetailViewModel(dcContext: dcContext, contactId: contactId)
         super.init(style: .grouped)
@@ -122,9 +125,15 @@ class ContactDetailViewController: UITableViewController {
         super.viewWillAppear(animated)
         updateHeader() // maybe contact name has been edited
         updateCellValues()
+        setupObservers()
         tableView.reloadData()
     }
 
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        removeObservers()
+    }
+
     // MARK: - setup and configuration
     private func configureTableView() {
         tableView.register(ActionCell.self, forCellReuseIdentifier: ActionCell.reuseIdentifier)
@@ -222,6 +231,47 @@ class ContactDetailViewController: UITableViewController {
         return viewModel.titleFor(section: section)
     }
 
+    // MARK: - observers
+    private func setupObservers() {
+        let nc = NotificationCenter.default
+        contactChangedObserver = nc.addObserver(
+            forName: dcNotificationContactChanged,
+            object: nil,
+            queue: OperationQueue.main) { [weak self] notification in
+            guard let self = self else { return }
+            if let ui = notification.userInfo,
+               self.viewModel.contactId == ui["contact_id"] as? Int {
+                self.updateHeader()
+            }
+        }
+        incomingMsgsObserver = nc.addObserver(
+            forName: dcNotificationIncoming,
+            object: nil,
+            queue: OperationQueue.main) { [weak self] notification in
+            guard let self = self else { return }
+            if let ui = notification.userInfo,
+               let chatId = ui["chat_id"] as? Int {
+                if self.viewModel.getSharedChatIds().contains(chatId) {
+                    self.viewModel.updateSharedChats()
+                    if self.viewModel.chatId == chatId {
+                        self.updateCellValues()
+                    }
+                    self.tableView.reloadData()
+                }
+            }
+        }
+    }
+
+    private func removeObservers() {
+        let nc = NotificationCenter.default
+        if let contactChangedObserver = self.contactChangedObserver {
+            nc.removeObserver(contactChangedObserver)
+        }
+        if let incomingMsgsObserver = self.incomingMsgsObserver {
+            nc.removeObserver(incomingMsgsObserver)
+        }
+    }
+
     // MARK: - updates
     private func updateHeader() {
         if viewModel.isSavedMessages {

deltachat-ios/ViewModel/ContactDetailViewModel.swift

@@ -38,7 +38,7 @@ class ContactDetailViewModel {
     let chatId: Int
     var isSavedMessages: Bool
     var isDeviceTalk: Bool
-    private let sharedChats: DcChatlist
+    private var sharedChats: DcChatlist
     private var sections: [ProfileSections] = []
     private var chatActions: [ChatAction] = []
     private var chatOptions: [ChatOption] = []
@@ -155,6 +155,19 @@ class ContactDetailViewModel {
         return sharedChats.getChatId(index: index)
     }
 
+    func getSharedChatIds() -> [Int] {
+        let max = sharedChats.length
+        var chatIds: [Int] = []
+        for n in 0..<max {
+            chatIds.append(sharedChats.getChatId(index: n))
+        }
+        return chatIds
+    }
+
+    func updateSharedChats() {
+        self.sharedChats = context.getChatlist(flags: 0, queryString: nil, queryId: contactId)
+    }
+
     func update(sharedChatCell cell: ContactCell, row index: Int) {
         let chatId = sharedChats.getChatId(index: index)
         let summary = sharedChats.getSummary(index: index)