Cannot invoke 'findObjectsInBackgroundWithBlock' with an argument list of type '(([AnyObject]!, NSError!) -> Void)' - ios

Question

I'm following a tutorial called How to Build a Simple iOS Chat App on Youtube which made by a channel called Code With Chris. I followed all his type and I got the following error in Xcode:
/Users/David/Documents/360Drive/Xcode/Try/Learn With Chris/ChatApp/ChatApp/ChatApp/ViewController.swift:53:15: Cannot invoke 'findObjectsInBackgroundWithBlock' with an argument list of type '(([AnyObject]!, NSError!) -> Void)'
Here's my code:
//
// ViewController.swift
// ChatApp
//
// Created by David Chen on 15/4/12.
// Copyright (c) 2015 cwsoft. All rights reserved.
//
import UIKit
import Parse
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate {
var messagesArray:[String] = [String]()
#IBOutlet weak var MessageTableView: UITableView!
#IBOutlet weak var ButtonSend: UIButton!
#IBOutlet weak var DockViewHeightConstraint: NSLayoutConstraint!
#IBOutlet weak var MessageTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
//Set delegate
self.MessageTableView.delegate = self
self.MessageTableView.dataSource = self
self.MessageTextField.delegate = self
let tapGesture:UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "tableViewTapped")
self.MessageTableView.addGestureRecognizer(tapGesture)
self.messagesArray.append("Test 1")
self.messagesArray.append("Test 2")
self.messagesArray.append("Test 3")
}
#IBAction func ButtonSendPressed(sender: UIButton) {
self.MessageTextField.endEditing(true)
var newMessageObject:PFObject = PFObject(className: "Message")
newMessageObject["Text"] = self.MessageTextField.text
newMessageObject.saveInBackgroundWithBlock {
(success: Bool, error: NSError?) -> Void in
if (success == true) {
NSLog("Success")
} else {
NSLog("Error")
}
}
}
func retrieveMessages() {
var query:PFQuery = PFQuery(className: "Messages")
query.findObjectsInBackgroundWithBlock {
(object: [AnyObject]!, error: NSError!) -> Void in
self.messagesArray = [String]()
for messageObject in objects {
let messageText:String? = (messageObject as PFObject)["Text"] as? String
if messagetext != nil {
self.messagesArray.append(messageText!)
}
}
}
self.MessageTableView.reloadData()
}
func tableViewTapped() {
self.MessageTextField.endEditing(true)
}
//MARK : TextField Delegage Methods
func textFieldDidBeginEditing(textField: UITextField) {
self.view.layoutIfNeeded()
UIView.animateWithDuration(0.5, animations: {
self.DockViewHeightConstraint.constant = 320
self.view.layoutIfNeeded()
}, completion: nil)
}
func textFieldDidEndEditing(textField: UITextField) {
self.view.layoutIfNeeded()
UIView.animateWithDuration(0.5, animations: {
self.DockViewHeightConstraint.constant = 60
self.view.layoutIfNeeded()
}, completion: nil)
}
//MARK : Table View Delegate Methods
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.MessageTableView.dequeueReusableCellWithIdentifier("MessageCell") as! UITableViewCell
cell.textLabel?.text = self.messagesArray[indexPath.row]
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return messagesArray.count
}
}
Here's the link of the tutorial
link
Thanks for any helpful suggestions :)

Answer 1

There have been many changes with the last xCode update. I can not really explain why exactly some changes need to be done. You better read the changeLogs! So will I later on :)
In the meantime try this:
func retrieveMessages() {
var query:PFQuery = PFQuery(className: "Messages")
query.findObjectsInBackgroundWithBlock {
(object, error) -> Void in
self.messagesArray = [String]()
for messageObject in object! {
let messageText:String? = (messageObject as! PFObject)["Text"] as? String
if messageText != nil {
self.messagesArray.append(messageText!)
}
}
}
self.MessageTableView.reloadData()
}
It seems that in some cases you don't need to specify the type anymore. In other cases you need to though. In this case, there is no need but you need unwrap your object array.