用iOS解析问题

我正在使用一个解析帐户将图像、消息和用户名发布到一个原型单元。由于某些原因，我的用户名字符串保持为空，因此不会发布到单元格中。你能帮忙吗？我对编码相当陌生，所以这一点让我感到困惑

​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
    }

---

您提供的代码中没有任何内容与您遇到的问题相关……我想，可能是我的查询在解析过程中出错了……我对编码相当陌生，因此调试此类问题对我来说很困难。