Ribbit Swift/Parse : search for a PFUser using UISearchBar

     import UIKit

      class AllFriendsTableViewController: UITableViewController, UISearchBarDelegate,      UISearchDisplayDelegate {
      @IBOutlet var SearchDisplay: UISearchDisplayController!

      var userList:NSMutableArray = NSMutableArray()

      func searchBarShouldBeginEditing(searchBar: UISearchBar!) -> Bool {
      return true
      }

       func searchBarShouldEndEditing(searchBar: UISearchBar!) -> Bool {
      return true

       }

       func searchBar(searchBar: UISearchBar!, textDidChange searchText: String!) {
      loadUser()
     }

      @IBOutlet var searchText: UISearchBar!

     func loadUser () {

      userList.removeAllObjects()
       var findUser:PFQuery = PFUser.query()
       findUser.whereKey("username", equalTo: searchText.text)


        findUser.findObjectsInBackgroundWithBlock { (objects:[AnyObject]!, error:NSError!) -> Void in
         if !(error != nil) {
        // The find succeeded.
        println("succesfull load Users")
        // Do something with the found objects
        for object  in objects  {
            self.userList.addObject(object)
            println("users added to userlist")
        }
        self.tableView.reloadData()
         } else {
        // Log details of the failure
        println("error loadind user ")
        println("error")
         }

        }
         }


         override func numberOfSectionsInTableView(tableView: UITableView!) -> Int {
       return 1
         }

       override func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {
       if tableView == searchDisplayController.searchResultsTableView {
         return userList.count
      }
      else {
         return 0
        }
         }

        override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {

         let cell: AllFirendsTableViewCell = self.tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)as                 AllFirendsTableViewCell


    let users:PFObject = self.userList.objectAtIndex(indexPath!.row) as PFObject


        var findUserName:PFQuery = PFUser.query()
       findUserName.whereKey("username", containsString: searchText.text)

       findUserName.findObjectsInBackgroundWithBlock{
        (objects:[AnyObject]!, error:NSError!) -> Void in

         if !(error != nil) {

             if let user:PFUser = users as? PFUser {
            cell.userNameTextField.text = user.username
            println("user exist")
            // define avatar poster

            if let avatarImage:PFFile = user["profileImage"] as? PFFile {
                avatarImage.getDataInBackgroundWithBlock{(imageData:NSData!, error:NSError!)-> Void in

                    if !(error != nil) {

                        let image:UIImage = UIImage(data: imageData)


                        cell.avatarImage.image = image as UIImage
                        cell.avatarImage.layer.cornerRadius = 24
                        cell.avatarImage.clipsToBounds = true

                    }

                }

            }
            else {
                cell.avatarImage.image = UIImage(named: "Avatar-1")
                cell.avatarImage.layer.cornerRadius = 24
                cell.avatarImage.clipsToBounds = true
            }
        }

       }
       }

          return cell

         }
        override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(true)
         navigationController.navigationBar.hidden = false
        loadUser()

         }

        override func viewDidAppear(animated: Bool) {

        }

        override func viewDidLoad() {


          // Do any additional setup after loading the view, typically from a nib.
      }
       }