Swift WKWebView(一)：基本使用

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一、创建，我们可以在Viewcontroller中使用如下的懒加载的方式创建一个WKWebView 以及一个便于观察进度的进度条：

	// wkWebView
    lazy var wkWebView = WKWebView()
    // 进度条
    lazy var progressView = UIProgressView() 

随后我们可以在viewDidLoad实现方法，将这两个控件添加到视图中，在这里要注意iphone机型的的适配，代码如下：

	override func viewDidLoad() {
        super.viewDidLoad()
     
        initInterface()
        
    }


    func initInterface() -> () {
        
        self.wkWebView.frame = CGRect(x: safeAreaInsets.left
            , y: safeAreaInsets.top + 44
            , width: ScreenWidth
            , height: ScreenHeight - safeAreaInsets.top - 44 - safeAreaInsets.bottom)
        let url = URL(string: "https://blog.csdn.net/kmonarch/article/details/82753235")
        let request = URLRequest(url: url!)
        wkWebView.navigationDelegate = self
        wkWebView.load(request)
        self.view.addSubview(self.wkWebView)
      

        self.progressView.frame = CGRect(x: safeAreaInsets.left
            , y: safeAreaInsets.top + 44
            , width: ScreenWidth
            , height: 2)
        progressView.progressTintColor = UIColor.red
        progressView.trackTintColor = UIColor.clear
        self.view.addSubview(self.progressView)
    }

二、实现代理方法

extension TestViewController: WKNavigationDelegate
{
    
    // 监听网页加载进度
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        
        self.progressView.progress = Float(self.wkWebView.estimatedProgress)
    }
    
    // 页面开始加载时调用
    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
        Log4jMessage(message: "开始加载...")
    }
    
    // 当内容开始返回时调用
    func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!){
        Log4jMessage(message: "当内容开始返回...")
    }
    
    // 页面加载完成之后调用
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!){
        Log4jMessage(message: "页面加载完成...")
        /// 获取网页title
        self.title = self.wkWebView.title
        
        UIView.animate(withDuration: 0.5) {
            self.progressView.isHidden = true
        }
    }
    
    // 页面加载失败时调用
    func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error){
        Log4jMessage(message: "页面加载失败...")
        UIView.animate(withDuration: 0.5) {
            self.progressView.progress = 0.0
            self.progressView.isHidden = true
        }
        /// 弹出提示框点击确定返回
        let alertView = UIAlertController.init(title: "提示", message: "加载失败", preferredStyle: .alert)
        let okAction = UIAlertAction.init(title:"确定", style: .default) { okAction in
            _=self.navigationController?.popViewController(animated: true)
        }
        alertView.addAction(okAction)
        self.present(alertView, animated: true, completion: nil)
    }
 
}

在下一章中将探讨使用WkWebView与h5进行交互