Provide Swift LiveQuery use case example for Realtime Messaging

[otymartin]

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Environment Setup

MongoLab(mLab), Google App Engine...
@nlutsenko @wangmengyan95

Since iOS docs aren't released yet i'm still struggling to implement live queries on the client side.
So I'd like to get an example for how it could be use to send/recieve realtime messages in a messaging app using a method I'm using in my own chat app which was previously using push notifications.

How could I implement liveQueries in this method to send/receive realtime messages?

// MARK: - LOAD MESSAGES
    func loadMessages() {

        print("Loading messages...")
        var lastMessage:JSQMessage? = nil

        if messages.last != nil {
            lastMessage = messages.last
        }

        let messageQuery = PFQuery(className: "Message")
        messageQuery.whereKey("room", equalTo: self.room!)
        messageQuery.orderByAscending("createdAt")
        messageQuery.limit = 500
        messageQuery.includeKey("user")

        if lastMessage != nil {
            messageQuery.whereKey("createdAt", greaterThan: lastMessage!.date)
        }

        messageQuery.findObjectsInBackgroundWithBlock { (results: [PFObject]?, error:NSError?) -> Void in

            if error == nil {

                if results != nil {

                    let messages = results

                    for message in messages! {

                        self.messageObjects.append(message)

                        let user = message["user"] as! PFUser
                        self.users.append(user)

                        let chatMessage = JSQMessage(senderId: user.objectId , displayName: user.objectForKey("name") as! String, text: message["content"] as! String)
                        self.messages.append(chatMessage)

                        Answers.logCustomEventWithName("Messages Loaded", customAttributes: nil)

                    }
                }

                if results?.count != 0 {
                    self.finishReceivingMessage()
                }

            }
        }

    }

Don't think my send method is needed but here it is either way.

   //MARK: - SEND MESSAGES
    override func didPressSendButton(button: UIButton!, withMessageText text: String!, senderId: String!, senderDisplayName: String!, date: NSDate!) {

        let message = PFObject(className: "Message")
        message["content"] = text
        message["room"] = self.room
        message["user"] = PFUser.currentUser()

        message.saveInBackgroundWithBlock { (success: Bool, error:NSError?) -> Void in

            if error == nil {

                self.loadMessages()
                //self.sendPushToContact()
                self.room!["lastUpdate"] = NSDate()
                self.room?.saveInBackgroundWithBlock(nil)
                Answers.logCustomEventWithName("Send Message", customAttributes: nil)

            } else {

                print("Error while sending message \(error?.localizedDescription)")
            }
        }
        self.finishSendingMessage()
    }

[wangmengyan95]

Hi @otymartin, we use this repo to track the parse-server related issues. Could you open the thread under our LiveQuery iOS client here. cc @richardjrossiii