WKWebView

WKWebView相对于UIWebView强大了很多，内存的消耗相对少了，所提供的接口也丰富了。

现在谈一谈WKWebView的基本使用

1. navigationDelegate

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  1. - (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation { // 类似UIWebView的 -webViewDidStartLoad:  
  2.     NSLog(@"didStartProvisionalNavigation");  
  3.     [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;  
  4. }  
  5.   
  6. - (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {  
  7.     NSLog(@"didCommitNavigation");  
  8. }  
  9.   
  10. - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation { // 类似 UIWebView 的 －webViewDidFinishLoad:  
  11.     NSLog(@"didFinishNavigation");  
  12.     [self resetControl];  
  13.     if (webView.title.length > 0) {  
  14.         self.title = webView.title;  
  15.     }  
  16.   
  17. }  
  18. - (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error {  
  19.     // 类似 UIWebView 的- webView:didFailLoadWithError:  
  20.   
  21.     NSLog(@"didFailProvisionalNavigation");  
  22.       
  23. }  
  24. - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {  
  25.       
  26.     decisionHandler(WKNavigationResponsePolicyAllow);  
  27. }  
  28.   
  29.   
  30. - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {  
  31.     // 类似 UIWebView 的 -webView: shouldStartLoadWithRequest: navigationType:  
  32.   
  33.     NSLog(@"4.%@",navigationAction.request);  
  34.   
  35.       
  36.     NSString *url = [navigationAction.request.URL.absoluteString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];  
  37.   
  38.       
  39.       
  40.     decisionHandler(WKNavigationActionPolicyAllow);  
  41.   
  42. }  
  43. - (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *))completionHandler {  
  44.       
  45. }  


2 UIDelegate

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  1. - (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {  
  2.     // 接口的作用是打开新窗口委托  
  3.     [self createNewWebViewWithURL:webView.URL.absoluteString config:configuration];  
  4.       
  5.     return currentSubView.webView;  
  6. }  
  7.   
  8. - (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)())completionHandler  
  9. {    // js 里面的alert实现，如果不实现，网页的alert函数无效  
  10.     UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message  
  11.                                                                              message:nil  
  12.                                                                       preferredStyle:UIAlertControllerStyleAlert];  
  13.     [alertController addAction:[UIAlertAction actionWithTitle:@"确定"  
  14.                                                         style:UIAlertActionStyleCancel  
  15.                                                       handler:^(UIAlertAction *action) {  
  16.                                                           completionHandler();  
  17.                                                       }]];  
  18.       
  19.     [self presentViewController:alertController animated:YES completion:^{}];  
  20.       
  21. }  
  22.   
  23.   
  24. - (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {  
  25.     //  js 里面的alert实现，如果不实现，网页的alert函数无效  ,   
  26.   
  27.     UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message  
  28.                                                                              message:nil  
  29.                                                                       preferredStyle:UIAlertControllerStyleAlert];  
  30.     [alertController addAction:[UIAlertAction actionWithTitle:@"确定"  
  31.                                                         style:UIAlertActionStyleDefault  
  32.                                                       handler:^(UIAlertAction *action) {  
  33.                                                           completionHandler(YES);  
  34.                                                       }]];  
  35.     [alertController addAction:[UIAlertAction actionWithTitle:@"取消"  
  36.                                                         style:UIAlertActionStyleCancel  
  37.                                                       handler:^(UIAlertAction *action){  
  38.                                                           completionHandler(NO);  
  39.                                                       }]];  
  40.       
  41.     [self presentViewController:alertController animated:YES completion:^{}];  
  42.       
  43. }  
  44.   
  45. - (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString *))completionHandler {  
  46.       
  47.     completionHandler(@"Client Not handler");  
  48.       
  49. }  



3. WKWebView 执行脚本方法

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  1. - (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^)(id, NSError *))completionHandler;  
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  1. completionHandler 拥有两个参数，一个是返回错误，一个可以返回执行脚本后的返回值  

4. WKWebView 的Cookie问题

UIWebView 中会自动保存Cookie，如果登录了一次，下次再次进入的时候，会记住登录状态

而在WKWebView中，并不会这样，WKWebView在初始化的时候有一个方法

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  1. - (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration  

通过这个方法，设置 configuration 让WKWebView知道登录状态，configuration 可以通过已有的Cookie进行设置，也可以通过保存上一次的configuration进行设置

参考 stackoverflow上回答：http://stackoverflow.com/questions/26573137/can-i-set-the-cookies-to-be-used-by-a-wkwebview/26577303#26577303

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  1. WKWebView * webView = /*set up your webView*/  
  2. NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://example.com/index.html"]];  
  3. [request addValue:@"TeskCookieKey1=TeskCookieValue1;TeskCookieKey2=TeskCookieValue2;" forHTTPHeaderField:@"Cookie"];  
  4. // use stringWithFormat: in the above line to inject your values programmatically  
  5. [webView loadRequest:request];  
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    1. WKUserContentController* userContentController = WKUserContentController.new;  
    2. WKUserScript * cookieScript = [[WKUserScript alloc]   
    3.     initWithSource: @"document.cookie = 'TeskCookieKey1=TeskCookieValue1';document.cookie = 'TeskCookieKey2=TeskCookieValue2';"  
    4.     injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];  
    5. // again, use stringWithFormat: in the above line to inject your values programmatically  
    6. [userContentController addUserScript:cookieScript];  
    7. WKWebViewConfiguration* webViewConfig = WKWebViewConfiguration.new;  
    8. webViewConfig.userContentController = userContentController;  
    9. WKWebView * webView = [[WKWebView alloc] initWithFrame:CGRectMake(/*set your values*/) configuration:webViewConfig];  

相关链接：

自己动手打造基于 WKWebView 的混合开发框架（一）——WKWebView 上手

iOS8 WebKit库之——WKWebView篇

使用iOS8 WKWebView的浏览器模块，脉冲动画层

【iOS】WKWebView的新特性与使用

WKWebView 的使用简介

UIWebView、WKWebView使用详解及性能分析

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原文地址：https://www.cnblogs.com/On1Key/p/5539870.html