EventsVC

import UIKit
import ZKCarousel
import WebKit

class EventsAndPromotionViewController: UIViewController, WKUIDelegate, WKNavigationDelegate {

    @IBOutlet weak var menuButton: UIBarButtonItem!
    @IBOutlet weak var arrowImage: UIImageView!
    @IBOutlet weak var webViewHeightConstraint: NSLayoutConstraint!
    @IBOutlet weak var eventPromotionLabel: UILabel!
    @IBOutlet weak var webViewContainer: UIView!
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet var carousel: ZKCarousel! = ZKCarousel()

    var isViewMore: Bool = false
    var eventTitles = [String]()
    var eventUrls = [String]()
    var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.title = "Events & Promotion"
        carousel.delegate = self

        // setup swreveal
        if revealViewController() != nil {
            menuButton.target = SWRevealViewController()
            menuButton.action = #selector(SWRevealViewController.revealToggle(_:))
            self.view.addGestureRecognizer(revealViewController().panGestureRecognizer())
            self.view.addGestureRecognizer(revealViewController().tapGestureRecognizer())
            revealViewController().rightViewRevealWidth = 160
        }

        eventPromotionLabel?.text = "Castrol Service & Win 2017"
        let title = ["Castrol Service & Win 2017", "Castrol Service & Win 2018", "Castrol Service & Win 2019"]
        eventTitles.append(contentsOf: title)
        let url = ["https://www.apple.com", "https://www.castrol.com/en_my/malaysia.html", "https://www.castrol.com/en_my/malaysia/services/castrol-auto-service/castrol-parts-warranty.html"]
        eventUrls.append(contentsOf: url)

        arrowImage.image = #imageLiteral(resourceName: "down-arrow")
        setupCarousel()
        setupWebView()
        self.webViewContainer.frame.size.height = 4000

    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    fileprivate func setupCarousel() {

        //create slide array
        carousel.backgroundColor = UIColor.clear
        carousel.alpha = 1
        let slide1 = ZKCarouselSlide(image: #imageLiteral(resourceName: "news&Promotion1"), title: "", description: "")
        let slide2 = ZKCarouselSlide(image: #imageLiteral(resourceName: "news&Promotion1"), title: "", description: "")
        let slide3 = ZKCarouselSlide(image: #imageLiteral(resourceName: "news&Promotion1"), title: "", description: "")

        //Add slide to carousel
        carousel.slides = [slide1, slide2, slide3]

    }

    fileprivate func setupWebView() {
        let webConfiguration = WKWebViewConfiguration()
        let customFrame = CGRect.init(origin: CGPoint.zero, size: CGSize.init(width: 0.0, height: self.webViewContainer.frame.size.height))
        self.webView = WKWebView(frame: customFrame , configuration: webConfiguration)
        webView.translatesAutoresizingMaskIntoConstraints = false
        self.webViewContainer.addSubview(webView)
        webView.topAnchor.constraint(equalTo: webViewContainer.topAnchor).isActive = true
        webView.rightAnchor.constraint(equalTo: webViewContainer.rightAnchor).isActive = true
        webView.leftAnchor.constraint(equalTo: webViewContainer.leftAnchor).isActive = true
        webView.bottomAnchor.constraint(equalTo: webViewContainer.bottomAnchor).isActive = true
        webView.heightAnchor.constraint(equalTo: webViewContainer.heightAnchor).isActive = true
        webView.uiDelegate = self
        webView.navigationDelegate = self

//        webView.frame.size.height = 1
//        webView.frame.size = webView.sizeThatFits(.zero)
//        webView.scrollView.isScrollEnabled=false;
//       // myWebViewHeightConstraint.constant = webView.scrollView.contentSize.height
//        webView.sizeToFit()

       // webViewHeightConstraint.constant = 0
        webViewContainer.isHidden = true
        self.view.layoutIfNeeded()

        let myURL = URL(string: "https://www.apple.com")
        let myRequest = URLRequest(url: myURL!)
        webView.scrollView.isScrollEnabled = false
        webView.load(myRequest)

    }


    @IBAction func viewMoreButtonTapped(_ sender: Any) {

        isViewMore = !isViewMore

        if isViewMore {
            UIView.animate(withDuration: 0.5, animations: {
                //self.webViewHeightConstraint.constant = 555
                self.webViewContainer.isHidden = false
                self.arrowImage.image = #imageLiteral(resourceName: "up-arrow")
                self.view.layoutIfNeeded()
            })
        } else {
            UIView.animate(withDuration: 0.5, animations: {
//                self.webViewHeightConstraint.constant = 0
                self.webViewContainer.isHidden = true
                self.arrowImage.image = #imageLiteral(resourceName: "down-arrow")
                self.view.layoutIfNeeded()
            })
        }
    }

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {

        if webView.isLoading == false {
            webView.evaluateJavaScript("document.body.scrollHeight", completionHandler: { [weak self] (result, error) in
                if let height = result as? CGFloat {
                    print("website height: \(height)")
                    print("view height: \(self?.view.frame.height)")
                    print("scroll view height: \(self?.scrollView.frame.height)")
                    print("web container height: \(self?.webViewContainer.frame.size.height)")
                    print("web view height: \(webView.frame.size.height)")
                    print("container constraint height: \(self?.webViewHeightConstraint.constant)")

                   // webView.frame.size.height += height
//                    self?.view.frame = CGRect(x: self!.view.frame.origin.x, y: self!.view.frame.origin.y, width: self!.view.frame.size.width, height: height)
//                    self?.scrollView.frame = CGRect(x: self!.scrollView.frame.origin.x, y: self!.scrollView.frame.origin.y, width: self!.scrollView.frame.size.width, height: height)
//                    self?.webViewHeightConstraint.constant = height
                }
            })
        }

    }


    /*
     // MARK: - Navigation

     // In a storyboard-based application, you will often want to do a little preparation before navigation
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
     // Get the new view controller using segue.destinationViewController.
     // Pass the selected object to the new view controller.
     }
     */

}

extension EventsAndPromotionViewController : lembuDelegate {

    func getIndexWhenScrolling(currentIndex: Int) {
        if currentIndex == 0 {
            eventPromotionLabel.text =  eventTitles[0]
            let myURL = URL(string: eventUrls[0])
            let myRequest = URLRequest(url: myURL!)
            webView.load(myRequest)
        } else if currentIndex == 1 {
            eventPromotionLabel.text =  eventTitles[1]
            let myURL = URL(string: eventUrls[1])
            let myRequest = URLRequest(url: myURL!)
            webView.load(myRequest)
        } else if currentIndex == 2 {
            eventPromotionLabel.text =  eventTitles[2]
            let myURL = URL(string: eventUrls[2])
            let myRequest = URLRequest(url: myURL!)
            webView.load(myRequest)
        }
    }
}