swift中wkwebview写加载进度条

直接上代码吧

import UIKit
import WebKit

class ShareWebViewController: UIViewController,WKUIDelegate, WKNavigationDelegate,UIWebViewDelegate {

    var index = 0
    var urlArr = NSArray()
    var titleArr = NSArray()
    var webView:WKWebView?
    lazy private var progressView: UIProgressView = {
        self.progressView = UIProgressView.init(frame: CGRect(x: CGFloat(0), y: CGFloat(1), width: UIScreen.main.bounds.width, height: 2))
        self.progressView.tintColor = UIColor.green      // 进度条颜色
        self.progressView.trackTintColor = UIColor.white // 进度条背景色
        return self.progressView
    }()
    override func viewDidLoad() {
        super.viewDidLoad()

        self.navigationController?.navigationBar.barTintColor  = UIColor.white

        setUpWKwebView()
    }
// 创建webview
    func setUpWKwebView() {
        
        let model = urlArr[index] as! advDataModel
        
        let webview = WKWebView(frame: CGRect.init(x: 0, y: 0, width: SCREEN_WIDTH, height: SCREEN_HEIGHT-64))
        let url = NSURL(string: model.url ?? "")
        let request = NSURLRequest.init(url: url! as URL)
        webview.load(request as URLRequest)
        self.view.addSubview(webview)
        self.view.addSubview(progressView)
        self.webView = webview
        self.webView?.uiDelegate = self
        self.webView?.navigationDelegate = self
        self.title = model.name
        
       self.webView?.addObserver(self, forKeyPath: "estimatedProgress", options: .new, context: nil)
    }
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    
        //  加载进度条
            if keyPath == "estimatedProgress"{
                progressView.alpha = 1.0
                progressView.setProgress(Float((self.webView?.estimatedProgress) ?? 0), animated: true)
                if (self.webView?.estimatedProgress ?? 0.0)  >= 1.0 {
                    UIView.animate(withDuration: 0.3, delay: 0.1, options: .curveEaseOut, animations: {
                        self.progressView.alpha = 0
                    }, completion: { (finish) in
                        self.progressView.setProgress(0.0, animated: false)
                    })
                }
            }
        }
    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!){

    }

    func webView(webView: WKWebView, didFinishNavigation navigation: WKNavigation!){
        MBProgressHUD.hideAllHUDs(for: self.view, animated: true)
    }
    func webViewDidClose(_ webView: WKWebView) {
        
    }
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {

    }
    deinit {
        self.webView?.removeObserver(self, forKeyPath: "estimatedProgress")
        self.webView?.uiDelegate = nil
        self.webView?.navigationDelegate = nil
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
}