WKWebView 的使用简介

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

- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation { // 类似UIWebView的 -webViewDidStartLoad: NSLog(@"didStartProvisionalNavigation"); [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;  
}  

- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation { NSLog(@"didCommitNavigation"); } - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation { // 类似 UIWebView 的 －webViewDidFinishLoad: NSLog(@"didFinishNavigation"); [self resetControl]; if (webView.title.length > 0) { self.title = webView.title;  
    }  

}  
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error { // 类似 UIWebView 的- webView:didFailLoadWithError: NSLog(@"didFailProvisionalNavigation"); } - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler { decisionHandler(WKNavigationResponsePolicyAllow); } - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler { // 类似 UIWebView 的 -webView: shouldStartLoadWithRequest: navigationType: NSLog(@"4.%@",navigationAction.request); NSString *url = [navigationAction.request.URL.absoluteString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];  



    decisionHandler(WKNavigationActionPolicyAllow);  

}  
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *))completionHandler { }

2.UIDelegate

- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures { // 接口的作用是打开新窗口委托 [self createNewWebViewWithURL:webView.URL.absoluteString config:configuration];  

    return currentSubView.webView;  
}  

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)())completionHandler { // js 里面的alert实现，如果不实现，网页的alert函数无效 UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message message:nil preferredStyle:UIAlertControllerStyleAlert]; [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) { completionHandler(); }]]; [self presentViewController:alertController animated:YES completion:^{}]; } - (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler { // js 里面的alert实现，如果不实现，网页的alert函数无效 , UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message message:nil preferredStyle:UIAlertControllerStyleAlert]; [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) { completionHandler(YES); }]]; [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action){ completionHandler(NO); }]]; [self presentViewController:alertController animated:YES completion:^{}]; } - (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString *))completionHandler { completionHandler(@"Client Not handler"); } 

1. WKWebView 执行脚本方法

- (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^)(id, NSError *))completionHandler;  

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  

1. 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

- (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

WKWebView * webView = /*set up your webView*/  
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://example.com/index.html"]];  
[request addValue:@"TeskCookieKey1=TeskCookieValue1;TeskCookieKey2=TeskCookieValue2;" forHTTPHeaderField:@"Cookie"];  
// use stringWithFormat: in the above line to inject your values programmatically  
[webView loadRequest:request];  

[objc] view plain copy print?在CODE上查看代码片派生到我的代码片
WKUserContentController* userContentController = WKUserContentController.new;  
WKUserScript * cookieScript = [[WKUserScript alloc]   
    initWithSource: @"document.cookie = 'TeskCookieKey1=TeskCookieValue1';document.cookie = 'TeskCookieKey2=TeskCookieValue2';"  
    injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];  
// again, use stringWithFormat: in the above line to inject your values programmatically  
[userContentController addUserScript:cookieScript];  
WKWebViewConfiguration* webViewConfig = WKWebViewConfiguration.new;  
webViewConfig.userContentController = userContentController;  
WKWebView * webView = [[WKWebView alloc] initWithFrame:CGRectMake(/*set your values*/) configuration:webViewConfig];  

转自:
http://blog.csdn.net/reylen/article/details/46437517