allowsMultipleSelection is not working in Swift?

Question

I am more than frustrated as it has wasted lot of my time. I don't know why allowsMultipleSelection is not working in my TableView? What all things has to be done to make it work, I did but still no result. Please take a look on my code and kindly let me know the issue.

override func viewDidLoad()
    {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

        self.participantsTableView.allowsMultipleSelection = true
}

if tableView == participantsTableView
        {
            var cell = tableView.cellForRowAtIndexPath(indexPath)!

            if cell.accessoryType == UITableViewCellAccessoryType.Checkmark
            {
                cell.accessoryType = UITableViewCellAccessoryType.None
            }

            else
            {
                cell.accessoryType == UITableViewCellAccessoryType.Checkmark
            }

            self.participantsTableView.reloadData()
        }

Answer 1

You need to implement delegate method tableView:didDeselectRowAtIndexPath: and update cell's accessoryType in tableView:cellForRowAtIndexPath:.

like this:

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    if let cell = tableView.cellForRowAtIndexPath(indexPath) {
        cell.accessoryType = .Checkmark
    }
}

func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
    if let cell = tableView.cellForRowAtIndexPath(indexPath) {
        cell.accessoryType = .None
    }
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("cellId", forIndexPath: indexPath) as UITableViewCell
    cell.textLabel?.text = String(indexPath.row)

    if let selectedPaths = tableView.indexPathsForSelectedRows() as? [NSIndexPath] {
        let selected = selectedPaths.filter(){ $0 == indexPath }
        if selected.count > 0 {
            cell.accessoryType = .Checkmark
        } else {
            cell.accessoryType = .None
        }
    }
    return cell
}