iOS SWIFT: Pull to Refresh Function Does Not Update TableView - ios

Question

I have pull to refresh functionality in TableView Controller, which lists all usernames and who the current user is following (indicated by a checkmark at the end of each row). Here is my refresh function:
var refresher: UIRefreshControl!
func refresh() {
var query = PFUser.query()
query?.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let users = objects {
self.usernames.removeAll(keepCapacity: true)
self.userids.removeAll(keepCapacity: true)
self.isFollowing.removeAll(keepCapacity: true)
for object in users {
if let user = object as? PFUser {
if user.objectId! != PFUser.currentUser()?.objectId {
self.usernames.append(user.username!)
self.userids.append(user.objectId!)
var query = PFQuery(className: "followers")
query.whereKey("follower", equalTo: PFUser.currentUser()!.objectId!)
query.whereKey("following", equalTo: user.objectId!)
query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let objects = objects {
if objects.count > 0
{
self.isFollowing[user.objectId!] = true
}
else
{
self.isFollowing[user.objectId!] = false
}
}
if self.isFollowing.count == self.usernames.count
{
self.tableView.reloadData()
self.refresher.endRefreshing()
}
})
}
}
}
}
})
}
It's called in my viewDidLoad:
override func viewDidLoad() {
super.viewDidLoad()
//pull to refresh funcationlity
refresher = UIRefreshControl()
refresher.attributedTitle = NSAttributedString(string: "Pull to refresh")
refresher.addTarget(self, action: "refresh", forControlEvents: UIControlEvents.ValueChanged)
self.tableView.addSubview(refresher)
refresh()
}
The problem is that when I delete an item manually from the Parse.com database, and pull to refresh in the list view, it does not update. Here are my tableview functions:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel?.text = usernames[indexPath.row]
let followedObjectId = userids[indexPath.row]
if isFollowing[followedObjectId] == true {
cell.accessoryType = UITableViewCellAccessoryType.Checkmark
}
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
var cell:UITableViewCell = tableView.cellForRowAtIndexPath(indexPath)!
let followedObjectId = userids[indexPath.row]
if isFollowing[followedObjectId] == false {
isFollowing[followedObjectId] = true
cell.accessoryType = UITableViewCellAccessoryType.Checkmark
var following = PFObject(className: "followers")
following["following"] = userids[indexPath.row]
following["follower"] = PFUser.currentUser()?.objectId
following.saveInBackground()
}
else
{
isFollowing[followedObjectId] = false
cell.accessoryType = UITableViewCellAccessoryType.None
var query = PFQuery(className: "followers")
query.whereKey("follower", equalTo: PFUser.currentUser()!.objectId!)
query.whereKey("following", equalTo: userids[indexPath.row])
query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let objects = objects {
for object in objects {
object.deleteInBackground()
print(object)
}
}
})
}
}