Adds a navigation item on all navigation controllers that inherit this class.

PKNavigationController

//
//  PKNavigationController.swift
//
//  Created by Pavan Kataria on 29/12/2015.
//  Copyright © 2015 Pavan Kataria. All rights reserved.
//

import UIKit

class PKNavigationController: UINavigationController {

    override func viewDidLoad() {
        super.viewDidLoad()
        if let topViewController = topViewController {
            addHamburgerIconToController(topViewController)
        }
    }
    func addHamburgerIconToController(rootViewController: UIViewController){
        rootViewController.view.backgroundColor = UIColor.whiteColor()
        rootViewController.navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Menu", style: .Plain, target: self, action: "presentLeftMenuViewController")
    }
}