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, width: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: 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: 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: 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: 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, width: 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("
测试标题
", 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)
    }
}

    @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)
    }