Parse Issue With iOS - ios

Question

I'm using a Parse account to post images, messages and username to a prototype cell. For some reason my username string is staying empty and thus not posting to the cell. Can you help? I'm fairly new to coding so this one has just stumped me.
​import UIKit
import Parse
class FeedTableViewController: UITableViewController {
var messages = [String]()
var usernames = [String]()
var imageFiles = [PFFile]()
var users = [String: String]()
var refresher: UIRefreshControl!
#IBAction func logout(sender: AnyObject) {
PFUser.logOut()
var currentUser = PFUser.currentUser()
performSegueWithIdentifier("logout", sender: self)
}
func swiped(gesture:UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.Right:
performSegueWithIdentifier("feedSwipe", sender: self)
//case UISwipeGestureRecognizerDirection.Up:
//print("User Swiped Up")
//case UISwipeGestureRecognizerDirection.Down:
//print("User Swiped Down")
case UISwipeGestureRecognizerDirection.Left:
performSegueWithIdentifier("feedSwipe", sender: self)
default:
break
}
}
}
func refresh() {
var query = PFUser.query()
query?.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let users = objects {
self.messages.removeAll(keepCapacity: true)
self.users.removeAll(keepCapacity: true)
self.imageFiles.removeAll(keepCapacity: true)
self.usernames.removeAll(keepCapacity: true)
for object in users {
if let user = object as? PFUser {
self.users[user.objectId!] = user.username!
}
}
}
var getFollowedUsersQuery = PFQuery(className: "followers")
getFollowedUsersQuery.whereKey("follower", equalTo: PFUser.currentUser()!.objectId!)
getFollowedUsersQuery.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if let objects = objects {
for object in objects {
var followedUser = object["following"] as! String
var query = PFQuery(className: "Post")
query.whereKey("userId", equalTo: followedUser)
query.orderByDescending("createdAt")
query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let objects = objects {
for object in objects {
self.messages.append(object["message"]! as! String)
self.imageFiles.append(object["imageFile"]! as! PFFile)
self.usernames.append(self.users[object["userId"] as! String]!)
//self.usernames.append(followedUser)
self.tableView.reloadData()
self.refresher.endRefreshing()
//print(followedUser)
}
}
})
}
}
}
})
}
override func viewDidLoad() {
super.viewDidLoad()
let swipeRight = UISwipeGestureRecognizer(target: self, action: "swiped:")
swipeRight.direction = UISwipeGestureRecognizerDirection.Right
self.view.addGestureRecognizer(swipeRight)
let swipeUp = UISwipeGestureRecognizer(target: self, action: "swiped:")
swipeUp.direction = UISwipeGestureRecognizerDirection.Up
self.view.addGestureRecognizer(swipeUp)
let swipeDown = UISwipeGestureRecognizer(target: self, action: "swiped:")
swipeDown.direction = UISwipeGestureRecognizerDirection.Down
self.view.addGestureRecognizer(swipeDown)
let swipeLeft = UISwipeGestureRecognizer(target: self, action: "swiped:")
swipeLeft.direction = UISwipeGestureRecognizerDirection.Left
self.view.addGestureRecognizer(swipeLeft)
refresher = UIRefreshControl()
refresher.attributedTitle = NSAttributedString(string: "Pull to refresh")
refresher.addTarget(self, action: "refresh", forControlEvents: UIControlEvents.ValueChanged)
self.tableView.addSubview(refresher)
refresh()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return usernames.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let myCell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! cell
imageFiles[indexPath.row].getDataInBackgroundWithBlock { (data, error) -> Void in
if let downloadedImage = UIImage(data: data!) {
myCell.postedImage.image = downloadedImage
}
}
myCell.username.text = usernames[indexPath.row]
myCell.message.text = messages[indexPath.row]
return myCell
}