WKWebView实现加载网页

1.首先要导入WebKit框架；2.通过- (instancetype)initWithFrame:(CGRect)frame方法创建WKWebView；3.设置对应代理navigationDelegate和UIDelegate；4.实现对应代理方法。5.通过WKWebView的configuration属性的userContentController调用- (void)addScriptMessageHandler:(id)scriptMessageHandler name:(NSString *)name方法来添加JS调用OC的方法；

WKNavigationDelegate代理方法：常用的处理跳转加载操作的代理                                                                         在发送请求之前，决定是否跳转   - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{}       

 页面开始加载时调用 - (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation  

在收到响应后，决定是否跳转:此方法必须设置对应的回调函数，否则会崩溃      - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler                      

当内容开始返回时调用- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation     

页面加载完成之后调用- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation

页面加载失败时调用- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error

WKUIDelegate代理方法：常用的主要处理JS脚本，确认框，警告框等

 创建一个新的WebView- (WKWebView*)webView:(WKWebView*)webView createWebViewWithConfiguration:(WKWebViewConfiguration*)configuration forNavigationAction:(WKNavigationAction*)navigationAction windowFeatures:(WKWindowFeatures*)windowFeatures{return[[WKWebViewalloc]init];}

 输入框- (void)webView:(WKWebView*)webView runJavaScriptTextInputPanelWithPrompt:(NSString*)prompt defaultText:(nullableNSString*)defaultText initiatedByFrame:(WKFrameInfo*)frame completionHandler:(void(^)(NSString* __nullableresult))completionHandler{ completionHandler(@"http");}

 确认框- (void)webView:(WKWebView*)webView runJavaScriptConfirmPanelWithMessage:(NSString*)message initiatedByFrame:(WKFrameInfo*)frame completionHandler:(void(^)(BOOLresult))completionHandler{ completionHandler(YES);}

 警告框- (void)webView:(WKWebView*)webView runJavaScriptAlertPanelWithMessage:(NSString*)message initiatedByFrame:(WKFrameInfo*)frame completionHandler:(void(^)(void))completionHandler{NSLog(@"%@",message); completionHandler();}

碰到问题：WKWebView需要手动添加cookie；第一次请求页面添加cookie可以在decidePolicyForNavigationAction代理方法中给请求头加上cookie；新页面中增加cookie需要在didFinishNavigation方法中给H5页面中增加对应cookie

目前只是简单认识了WKWebView；更深的问题还需要继续研究。。。