Update tableView row from AppDelegate Swift 4 - ios

Question

[![enter image description here][1]][1]
Hello. I have a tableview like in the picture above and I'm receiving some silent push notifications. Depending on them I need to reload a specific cell from the tableView. Since I'm getting the notification in the AppDelegate and there at the moment I'm reloading the whole tableView...but personally I don't find this the best solution since I only need to update a specific row.
Any hints please how can I update just a specific cell from appDelegate?
if userInfo["notification_type"] as? String == "update_conversation" {
if let rootVC = (self.window?.rootViewController as? UINavigationController)?.visibleViewController {
if rootVC is VoiceViewController {
let chatRoom = rootVC as! VoiceViewController
chatRoom.getConversations()
// the get Conversations method makes a call to api to get some data then I reload the whole tableView
}
}
func getConversations() {
let reachabilityManager = NetworkReachabilityManager()
if (reachabilityManager?.isReachable)! {
ServerConnection.getAllConversation { (data) in
if let _ = data{
self.conversations = data
self.onlineRecent = self.conversations
GlobalMainQueue.async {
self.mainTableView.reloadData()
}
}
}
}
}
This is my getConversation method which is used in VoiceViewController to populate my tableview

Answer 1

Have the app delegate broadcast an app-specific notification center notification (on the main thread). Have the view controller that contains your table view listen for that notification and update the cell in question as needed. That way you don't contaminate your app delegate. The app delegate should only deal with system level app stuff, not business logic.

Answer 2

You could get your row’s cell using self.mainTableView.cellForRow(at:IndexPath(…), and update it directly.
Or, I’ve found you save a load of time and your view controllers end up more reliable using ALTableViewHelper [commercial - available on Framework Central here]. It’s free to try.
The helper does the most of the work - you describe how the data connects to the UITableView. I’ve put together an example (on GitHub here), which I hope is something like what you’re trying to do.
import ALTableViewHelper
class VoiceViewController {
// #objc for the helper to see the var’s, and dynamic so it sees any changes to them
#obj dynamic var conversations: Any?
#obj dynamic var onlineRequest: Any?
func viewDidLoad() {
super.viewDidLoad()
tableView.setHelperString(“””
section
headertext "Conversation Status"
body
Conversation
$.viewWithTag(1).text <~ conversations[conversations.count-1]["title"]
$.viewWithTag(2).text <~ "At \\(dateFormat.stringFromDate(conversations[conversations.count-1]["update"]))"
UpdateButton
$.viewWithTag(1).isAnimating <~ FakeConversationGetter.singleton.busy
“””, context:self)
}
func getConversations() {
let reachabilityManager = NetworkReachabilityManager()
if (reachabilityManager?.isReachable)! {
ServerConnection.getAllConversation { (data) in
if let _ = data {
// change the data on the main thread as this causes the UI changes
GlobalMainQueue.async {
self.conversations = data
self.onlineRequest = self.conversations
}
}
}
}
}