swift -> WKWebView

** 解决 webView 加载含有中文的 URL 问题

将URL 中的中文以及其他非英文字符进行转换 URLEncode

extension String {
    func urlEncodeIfNeed() -> String {
        if let url:URL = URL(string: self){
            if(UIApplication.shared.canOpenURL(url) == true){
                return self;
            }
        }
        return NSString.init(string: self).addingPercentEncoding(withAllowedCharacters: NSCharacterSet.urlQueryAllowed)!
    }

}

** 清除webView 缓存

let websetDataType = WKWebsiteDataStore.allWebsiteDataTypes();
let dateFrom:NSDate = NSDate.init(timeIntervalSince1970: 0)
WKWebsiteDataStore.default().removeData(ofTypes: websetDataType, modifiedSince: dateFrom as Date, completionHandler: {
    print("clear done")
})

//其中 WKWebsiteDataStory 的 类型有
let cookie = WKWebsiteDataTypeCookies;//网址的cookies
let disCache = WKWebsiteDataTypeDiskCache;//磁盘缓存文件，比如图片文件
let WebApplicationCache = WKWebsiteDataTypeOfflineWebApplicationCache;//离线数据
let MemoryCache = WKWebsiteDataTypeMemoryCache;//内存缓存
let LocalStorage = WKWebsiteDataTypeLocalStorage;//网站通过代码写入到本地的数据
let SessionStorage = WKWebsiteDataTypeSessionStorage;//网站通过代码写入到本地的session
let IndexedDBDatabases = WKWebsiteDataTypeIndexedDBDatabases;//
let WebSQLDatabases = WKWebsiteDataTypeWebSQLDatabases;//

如果是 IOS 8 不支持以上清除缓存的方式，兼容清除, 以及手动删除Library/Caches文件夹等

http://mft.iteye.com/admin/blogs/2381013

也可以直接根据需要删除 document 下的文件夹

http://mft.iteye.com/admin/blogs/2394856

** 解决 target = "_blank" 打开新窗口问题

import WebKit

Extend your class with WKUIDelegate

Set delegate for webview

self.webView.uiDelegate = self

Implement protocol method

    func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
        if navigationAction.targetFrame == nil {
            //webView.load(navigationAction.request)
            print(navigationAction.request);
            print("new target")
        }
        return nil
    }

** 获取上一个页面的URL

wb.backForwardList.backItem?.url.absoluteString

** 判断当前加载的页面是通过返回还是前进或者提交表单等

    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
        if(navigationAction.navigationType != .backForward){
                   
        }

** 去掉下拉时的橡皮筋效果

wkWebView.scrollView.bounces = false;

** 加载 hml 字符串

        let jsUrl:String = "https://xw.qq.com";
        
        var source:String = "";
        let js_url = NSURL(string: jsUrl);
 
        do {
            print("1")
            let data = try NSString(contentsOf: js_url! as URL, encoding: UInt(String.Encoding.utf8.hashValue))
            print("2")
            source = data as String;
            print(source);
            print("3")
        } catch {
            print("jjj false")
        }
        print("done")
        

        if(source != ""){
            let wk:WKWebView = WKWebView(frame: self.view.frame);
            wk.loadHTMLString(source, baseURL: js_url! as URL)
            self.view.addSubview(wk)
        }

--------------------------------WKWebView 其他相关知识参考 ----------------------------------------------

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