WKWebView

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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

WKWebView

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