UITableView not updating on reloadData

Question

I have two tableview on the screen. I have set delegate & datasource for both tableview. Lets have consider one table to show main filters & on click of particular cell/filter i have to reload subfilters in second tableview.

So i tried very simple solutions, didSelectRowAt,

subfilterTableView.reloadData()

Even i have tried by calling on main thread too,

DispatchQueue.main.async { 
    subfilterTableView.reloadData()
}

Still its not reloading the subfilterTableView.

I know this beginUpdates() & endUpdates() method are only for to insert & delete cells still i have reload in between beginUpdates() & endUpdates() it make crash as it is accepted.

I know this is stupid question but i have tried every possible simpler solutions.

Following are the some conditions which i come across:

1. Sometime data get populated on second click
2. Sometime data get populated after 3-5 seconds
3. Data get populated on refresh of tableview too

irony is Data get properly populated on real device

Following is my code:

 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        if tableView.tag == 1 {
            return filters.count
        }
        else{
            return subFilters.count
        }
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        if tableView.tag == 1 {
            let filter = filters[indexPath.row]
            let cell = tableView.dequeueReusableCell(withIdentifier: "FilterTableViewCell", for: indexPath) as! FilterTableViewCell
            cell.labelFilter.text = filter["filterName"] as? String
            cell.backgroundColor = UIColor.clear
            cell.preservesSuperviewLayoutMargins = false
            cell.separatorInset = UIEdgeInsets.zero
            cell.layoutMargins = UIEdgeInsets.zero
            cell.selectionStyle = .none
            return cell
        }
        else{
            let cell = tableView.dequeueReusableCell(withIdentifier: "SubFilterTableViewCell", for: indexPath) as! SubFilterTableViewCell
            cell.labelSubfilter.text = subFilters[indexPath.row]
            cell.backgroundColor = UIColor.clear
            cell.selectionStyle = .none
            return cell
        }
    }


 func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

        if tableView.tag == 1 {

            let selectedCell:FilterTableViewCell = tableView.cellForRow(at: indexPath)! as! FilterTableViewCell
            selectedCell.labelFilter.textColor = UIColor.black
            selectedCell.contentView.backgroundColor = UIColor.white
            subFilters = filters[indexPath.row]["subFilterValue"] as! [String]


            self.tableViewSubfilters.reloadData()



//            DispatchQueue.main.async {
//                self.tableViewSubfilters.reloadData()
//            }
//            tableViewSubfilters.performSelector(onMainThread: #selector(self.reloadData), with: nil, waitUntilDone: true)
        }

    }

Answer 1

It seems that your code does not have any issue

Just run it on real device instead of simulator

Answer 2

Do check the Datasource and Delegates of your second tableview.

subfilterTableView.dataSource = self
subfilterTableView.delegate   = self

Answer 3

Put in viewDidLoad():

func viewDidLoad() {
    tableView.delegate = self
    tableView.datasource = self
}