1.iOS12 之前 使用 UIWebView

1>    private lazy var webV : UIWebView = {        let v = UIWebView(frame: self.view.bounds)                let url = URL(string: "https://www.baidu.com/")        v.delegate = self        if let url = url {            let  urlRequest = URLRequest(url: url)            v.loadRequest(urlRequest)        }        return v    }()2>    override func viewDidLoad() {        super.viewDidLoad()        view.addSubview(webV)    }3>extension ViewController:UIWebViewDelegate{    }

　　

2. iOS 12 之后 系统推荐WKWebView 替代 UIWebView

1>    private lazy var wkWebV: WKWebView = {        let config = WKWebViewConfiguration()        // 设置偏好设置        config.preferences = WKPreferences()        //        // 默认为0        //        config.preferences.minimumFontSize = 10        // 默认认为YES        config.preferences.javaScriptEnabled = true        // 在iOS上默认为NO，表示不能自动通过窗口打开        config.preferences.javaScriptCanOpenWindowsAutomatically = false        // web内容处理池，由于没有属性可以设置，也没有方法可以调用，不用手动创建        config.processPool = WKProcessPool()        // 通过JS与webview内容交互        config.userContentController = WKUserContentController()        // 注入JS对象名称AppModel，当JS通过AppModel来调用时，        // 我们可以在WKScriptMessageHandler代理中接收到//        config.userContentController.add(self, name: "AppModel")                let url = URL(string: "https://www.baidu.com/")                let web = WKWebView(frame: view.bounds, configuration: config)        web.navigationDelegate = self        web.uiDelegate = self        if let url = url {            let  urlRequest = URLRequest(url: url)            web.load(urlRequest)                    }        return web    }()2>view.addSubview(wkWebV)3.extension ViewController:WKNavigationDelegate,WKUIDelegate,WKScriptMessageHandler{    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {            }        }