Parse Livechat

LiveQuerryArray.swift

import Foundation
import Parse
import ParseLiveQuery

extension _ArrayType where Generator.Element == PFObject {
    mutating func updateWithEvent(event: Event<PFObject>) {
        switch event {
        case .Created(let object):
            append(object)
        case .Entered(let object):
            append(object)
        case .Deleted(let object):
             if let index = indexOf(object) {
                removeAtIndex(index)
            }
        case .Left(let object):
            if let index = indexOf(object) {
                removeAtIndex(index)
            }
        case .Updated(let object):
            if let index = indexOf(object) {
                self[index] = object
            }
        }
    }
}

LiveQuerryArraySwift3.swift

import Foundation
import Parse
import ParseLiveQuery

extension _ArrayProtocol where Iterator.Element == PFObject {
    mutating func updateWithEvent(event: Event<PFObject>) {
        switch event {
        case .created(let object):
                append(object)
        case .entered(let object):
                append(object)
        case .deleted(let object):
            if let index = index(of: object) {
                remove(at: index)
            }
        case .left(let object):
            if let index = index(of: object) {
                remove(at: index)
            }
        case .updated(let object):
            if let index = index(of: object) {
                //I got an error : Cannot assign through subscript: subscript is get-only
                self[index] = object
                
            }
        }
    }
}

TableViewController.swift

import UIKit
import Parse
import ParseLiveQuery

class TableViewController: UITableViewController {
    // MARK: - Properties
    var games = [PFObject]() {
        didSet {
            tableView.reloadData()
        }
    }
    var myQuery: PFQuery? {
        return MyPFSubclassObject.query()?
            .whereKey(myKey, equalTo: "Something")
            .orderByAscending("createdAt")
    }

    private var subscription: Subscription<Game>?

    // MARK: - Methods
    override func viewDidLoad() {
        super.viewDidLoad()
        load()
    }

    /**
     Load games from DB
     */
    func load() {
        myQuery?.findObjectsInBackgroundWithBlock({ (objects, error) in
            if error == nil {
                if let objects = objects {
                    self.games = objects
                    self.subscribeToUpdates()
                }
            } else {
                print("error : \(error?.userInfo)")
            }
        })
    }

    /**
     Check for any update and modify games property accordingly
 	*/
    func subscribeToUpdates() {
        let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
        // Live query client is created in app delegate and available as a property
        if let liveQueryClient = appDelegate.liveQueryClient, myQuery = myQuery {
            subscription = liveQueryClient
                .subscribe(myQuery)
                .handleEvent { _, event in
                    self.games.updateWithEvent(event)
            }
        }

    }

    // Classic table view logic continues with games as data source
}