Separate cookie storage for two UIWebView

I want to login many accounts of same site in different webView. For example i have Tab Bar Controller That contains three View Controllers and each View Controllers contain webView. And for example i embed stackoverflow url for webView in every class. How user can login to different accounts at the same time using these three webView? I've tried this but i just login one user at a time. I've found that i need to create separate cookie for every UIWebView, but mostly answers are in objective-c and not proper answer as i want. For example (First Second Third) Can any one please tell me how i can do it??

class FirstViewController: UIViewController , UIWebViewDelegate{

    @IBOutlet weak var webView: UIWebView!
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!

    override func viewDidLoad() {
        webView.delegate = self
        let requestURL = NSURL(string: "http://stackoverflow.com")
        let request = NSURLRequest(URL: requestURL!)
        activityIndicator.hidesWhenStopped = true
        activityIndicator.startAnimating()
        webView.loadRequest(request)

    }
       func webViewDidFinishLoad(webView: UIWebView) {
        activityIndicator.stopAnimating()
    }

}

class SecondViewController: UIViewController, UIWebViewDelegate{

    @IBOutlet weak var webView: UIWebView!
    @IBOutlet weak var activityIndicator: UIActivityIndicatorView!

    override func viewDidLoad() {
        webView.delegate = self
        let requestURL = NSURL(string: "http://stackoverflow.com")
        let request = NSURLRequest(URL: requestURL!)
        activityIndicator.hidesWhenStopped = true
        activityIndicator.startAnimating()
        webView.loadRequest(request)

    }
        func webViewDidFinishLoad(webView: UIWebView) {
        activityIndicator.stopAnimating()
    }


}

Thanks

I also found this. If this is helpful as my requirement i want, how i can use it in my code? Thanks

func loadCookies() {

    let cookieDict : NSMutableArray? = NSUserDefaults.standardUserDefaults().valueForKey("cookieArray") as? NSMutableArray

    if cookieDict != nil {

        for var c in cookieDict! {

            let cookies = NSUserDefaults.standardUserDefaults().valueForKey(c as! String) as! NSDictionary
            let cookie = NSHTTPCookie(properties: cookies as! [String : AnyObject])

            NSHTTPCookieStorage.sharedHTTPCookieStorage().setCookie(cookie!)
        }
    }
}

func saveCookies() {

    var cookieArray = NSMutableArray()
    let savedC = NSHTTPCookieStorage.sharedHTTPCookieStorage().cookies

    for var c : NSHTTPCookie in savedC! {

        var cookieProps = NSMutableDictionary()
        cookieArray.addObject(c.name)
        cookieProps.setValue(c.name, forKey: NSHTTPCookieName)
        cookieProps.setValue(c.value, forKey: NSHTTPCookieValue)
        cookieProps.setValue(c.domain, forKey: NSHTTPCookieDomain)
        cookieProps.setValue(c.path, forKey: NSHTTPCookiePath)
        cookieProps.setValue(c.version, forKey: NSHTTPCookieVersion)
        cookieProps.setValue(NSDate().dateByAddingTimeInterval(2629743), forKey: NSHTTPCookieExpires)

        NSUserDefaults.standardUserDefaults().setValue(cookieProps, forKey: c.name)
        NSUserDefaults.standardUserDefaults().synchronize()

    }

    NSUserDefaults.standardUserDefaults().setValue(cookieArray, forKey: "cookieArray")
}