先上代码： xcode 9.4 ios 11.4
import UIKit import WebKit class RootViewController: UIViewController, WKNavigationDelegate { var webView: WKWebView! override func viewDidLoad() { super.viewDidLoad() // 创建视图 let screen = UIScreen.main.bounds // 按钮栏 let buttonBarWidth:CGFloat = 316 let buttonBar = UIView(frame: CGRect(x: (screen.size.width - buttonBarWidth)/2, y: 20, buttonBarWidth, height: 70)) self.view.addSubview(buttonBar) let width = buttonBar.frame.size.width / 2 - 10 //添加按钮 let buttonHTML = UIButton(type: UIButtonType.system) buttonHTML.setTitle("通过路径加载", for: UIControlState()) buttonHTML.frame = CGRect(x:0, y:0, width, height: 30) //添加事件 buttonHTML.addTarget(self, action: #selector(buttonHTML(_:)), for: .touchUpInside) buttonBar.addSubview(buttonHTML) //添加 loadHTMLString 按钮 let loadHTMLString = UIButton(type: UIButtonType.system) loadHTMLString.setTitle("loadHTMLString", for: UIControlState()) loadHTMLString.frame = CGRect(x: width + 10, y:0, width, height: 30) //添加事件 loadHTMLString.addTarget(self, action: #selector(loadHTMLString(_:)), for: .touchUpInside) buttonBar.addSubview(loadHTMLString) //添加loadData按钮 let loadData = UIButton(type: UIButtonType.system) loadData.setTitle("loadData", for: UIControlState()) loadData.frame = CGRect(x:0, y: 40, width, height: 30) //添加事件 loadData.addTarget(self, action: #selector(loadData(_:)), for: .touchUpInside) buttonBar.addSubview(loadData) //添加loadRequest按钮--- 加载网络地址 let loadRequest = UIButton(type: UIButtonType.system) loadRequest.setTitle("loadRequest", for: UIControlState()) loadRequest.frame = CGRect(x: width + 10, y: 40, width, height: 30) //添加事件 loadRequest.addTarget(self, action: #selector(loadRequest(_:)), for: .touchUpInside) buttonBar.addSubview(loadRequest) //添加WKWebView self.webView = WKWebView(frame: CGRect(x:0, y: 100, screen.size.width, height: screen.size.height - 100 )) self.view.addSubview(webView) } // 加载本地html 点击事件 @objc func buttonHTML(_ sender: AnyObject){ // 方法一 加载路径 let htmlPath = Bundle.main.path(forResource: "index", ofType: "html") if let htmlPath = htmlPath { let url = URL.init(fileURLWithPath: htmlPath) // 把字符串 转成 URL 类型 let request = URLRequest(url: url) self.webView.load(request) self.webView.navigationDelegate = self } // 方法二 加载路径 // let htmlPath = Bundle.main.url(forResource: "index", withExtension: "html") // if let htmlPath = htmlPath{ // let request = URLRequest(url: htmlPath) // self.webView.load(request) // self.webView.navigationDelegate = self // } } // loadHTMLString @objc func loadHTMLString(_ sender: AnyObject){ // 方法一 直接加载 html 字符串 // let bundleUrl = NSURL.fileURL(withPath: Bundle.main.bundlePath) // self.webView.loadHTMLString("<html><head><meta charset='utf-8'/><title>测试</title></head><body><h1>测试标题</h1></body></html>", baseURL: bundleUrl) // 方法二 把本地文件转成字符串，进行加载 let htmlPath = Bundle.main.path(forResource: "index2", ofType: "html") let bundleUrl = NSURL.fileURL(withPath: Bundle.main.bundlePath) do{ let html = try NSString(contentsOfFile: htmlPath!, encoding: String.Encoding.utf8.rawValue) self.webView.loadHTMLString(html as String, baseURL: bundleUrl) }catch let err as NSError{ err.description } } // loadData 方式加载 -- > loadData 已经转换成--> load @objc func loadData(_ sender: AnyObject){ let htmlPath = Bundle.main.path(forResource: "index3", ofType: "html") let bundleUrl = NSURL.fileURL(withPath: Bundle.main.bundlePath) let htmlData = NSData(contentsOfFile: htmlPath!) // NSData 要先转换成 Data 类型 self.webView.load(htmlData! as Data, mimeType: "text/html", characterEncodingName: "utf-8", baseURL: bundleUrl) } // loadRequest 加载网络路径 ---> loadRequest 已经改为 load , NSURL --> URL,NSURLRequest --> URLRequest @objc func loadRequest(_ sender: AnyObject){ let url = URL(string: "https://baidu.com") let request = URLRequest(url: url!) self.webView.load(request) self.webView.navigationDelegate = self } // 委托协议的监听方法 func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) { print("开始加载") } func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) { print("内容开始返回") } func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) { print("加载完成") } func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) { print("加载失败 error:" + error.localizedDescription) } }
上面 有四种方式 加载html 网页，
加载本地 html 的方法 有：
- buttonHTML
- loadHTMLString
- loadData
加载网络路径
loadRequest
案例中每一种方法都可以加载成功，加载方式大同小异
加载本地文件，会自动去找到文件，如上图 2 个静态文件夹，里面没找到就会寻找外面的静态文件夹。
加载网络资源会报错处理一下就好：https://www.cnblogs.com/bruce-gou/p/10517044.html
以上的方式 文件夹是通过 NEW Group 的方式创建的。
如果是 通过菜单 Add Files to 这种方式创建的 则不可以。这种方式创建的文件夹是蓝色的如图
通过以上方式创建的文件，通过 Bundle.main.path(forResource: "index", ofType: "html") 取不到路径
@objc func test(_ sender: AnyObject){ let bundlePath = Bundle.main.bundlePath let path = "file://(bundlePath)/assets/index.html" let url = URL(string: path); let request = URLRequest(url: url!) self.webView.load(request) }
这样就可以取到路径值，就可以正常加载