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

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。

0.WKWebView创建

0.1属性

打开左划回退功能self.webView.allowsBackForwardNavigationGestures=YES;

WKWebView里有一个属性estimatedProgress，可以拿到进度。 但是并没有delegate来好让你更新进度控件。 所以一定要用进度的话，需要一个NSRunLoop

self.wkWebView = [[WKWebView alloc]initWithFrame:CGRectMake(0, 0, ScreenWidth, ScreenHeight-64-50-self.topViewH.constant)];

self.wkWebView.navigationDelegate = self;

self.wkWebView.UIDelegate = self;

[self.bWebView addSubview:self.wkWebView];

self.wkWebView.scrollView.scrollEnabled = NO;

self.wkWebView.allowsBackForwardNavigationGestures = NO;

1. navigationDelegate

- (void)webView:(WKWebView*)webViewdidStartProvisionalNavigation:(WKNavigation*)navigation {// 类似UIWebView的 -webViewDidStartLoad:页面开始加载时调用

NSLog(@"didStartProvisionalNavigation");[UIApplicationsharedApplication].networkActivityIndicatorVisible=YES;

}

- (void)webView:(WKWebView*)webViewdidCommitNavigation:(WKNavigation*)navigation {当内容开始返回时调用NSLog(@"didCommitNavigation");}

- (void)webView:(WKWebView*)webViewdidFinishNavigation:(WKNavigation*)navigation {// 类似 UIWebView 的 －webViewDidFinishLoad:页面加载完成之后调用

NSLog(@"didFinishNavigation");[selfresetControl];

if(webView.title.length>0) {

self.title= webView.title;

}

}

- (void)webView:(WKWebView*)webViewdidFailProvisionalNavigation:(WKNavigation*)navigationwithError:(NSError*)error {

// 类似 UIWebView 的- webView:didFailLoadWithError:页面加载失败时调用

NSLog(@"didFailProvisionalNavigation");

}

//页面跳转的代理方法有三种，分为（收到跳转与决定是否跳转两种）

- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation{//// 接收到服务器跳转请求之后调用

NSLog(@"6------");

}

- (void)webView:(WKWebView*)webViewdecidePolicyForNavigationResponse:(WKNavigationResponse*)navigationResponsedecisionHandler:(void(^)(WKNavigationResponsePolicy))decisionHandler {//// 在收到响应后，决定是否跳转

decisionHandler(WKNavigationResponsePolicyAllow);

}

- (void)webView:(WKWebView*)webViewdecidePolicyForNavigationAction:(WKNavigationAction*)navigationActiondecisionHandler:(void(^)(WKNavigationActionPolicy))decisionHandler {// 在发送请求之前，决定是否跳转

// 类似 UIWebView 的 -webView: shouldStartLoadWithRequest: navigationType:

NSLog(@"4.%@",navigationAction.request);

NSString*url = [navigationAction.request.URL.absoluteStringstringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

decisionHandler(WKNavigationActionPolicyAllow);

}

- (void)webView:(WKWebView*)webViewdidReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge*)challengecompletionHandler:(void(^)(NSURLSessionAuthChallengeDisposition,NSURLCredential*))completionHandler {

}

2 UIDelegate

- (WKWebView*)webView(WKWebView*)webViewcreateWebViewWithConfiguration:(WKWebViewConfiguration*)configurationforNavigationAction:(WKNavigationAction*)navigationActionwindowFeatures:(WKWindowFeatures*)windowFeatures {

// 接口的作用是打开新窗口委托

[selfcreateNewWebViewWithURL:webView.URL.absoluteStringconfig:configuration];

returncurrentSubView.webView;

}

- (void)webView:(WKWebView*)webViewrunJavaScriptAlertPanelWithMessage:(NSString*)messageinitiatedByFrame:(WKFrameInfo*)framecompletionHandler:(void(^)())completionHandler

{// js 里面的alert实现，如果不实现，网页的alert函数无效

UIAlertController*alertController = [UIAlertControlleralertControllerWithTitle:message

message:nil

preferredStyle:UIAlertControllerStyleAlert];

[alertControlleraddAction:[UIAlertActionactionWithTitle:@"确定"

style:UIAlertActionStyleCancel

handler:^(UIAlertAction*action) {

completionHandler();

}]];

[selfpresentViewController:alertControlleranimated:YEScompletion:^{}];

}

- (void)webView:(WKWebView*)webViewrunJavaScriptConfirmPanelWithMessage:(NSString*)messageinitiatedByFrame:(WKFrameInfo*)framecompletionHandler:(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 = [UIAlertControlleralertControllerWithTitle:message

message:nil

preferredStyle:UIAlertControllerStyleAlert];

[alertControlleraddAction:[UIAlertActionactionWithTitle:@"确定"

style:UIAlertActionStyleDefault

handler:^(UIAlertAction*action) {

completionHandler(YES);

}]];

[alertControlleraddAction:[UIAlertActionactionWithTitle:@"取消"

style:UIAlertActionStyleCancel

handler:^(UIAlertAction*action){

completionHandler(NO);

}]];

[selfpresentViewController:alertControlleranimated:YEScompletion:^{}];

}

- (void)webView:(WKWebView*)webViewrunJavaScriptTextInputPanelWithPrompt:(NSString*)promptdefaultText:(NSString*)defaultTextinitiatedByFrame:(WKFrameInfo*)framecompletionHandler:(void(^)(NSString*))completionHandler {

completionHandler(@"Client Not handler");

}

3. WKWebView 执行脚本方法

- (void)evaluateJavaScript:(NSString*)javaScriptStringcompletionHandler:(void(^)(id,NSError*))completionHand

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

- (instancetype)initWithFrame:(CGRect)frameconfiguration:(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

例子一

WKWebView* webView =/*set up your webView*/

NSMutableURLRequest* request = [NSMutableURLRequestrequestWithURL:[NSURLURLWithString:@"http://example.com/index.html"]];

[requestaddValue:@"TeskCookieKey1=TeskCookieValue1;TeskCookieKey2=TeskCookieValue2;"forHTTPHeaderField:@"Cookie"];

// use stringWithFormat: in the above line to inject your values programmatically

[webViewloadRequest:request];

例子二

WKUserContentController* userContentController = WKUserContentController.new;

WKUserScript* cookieScript = [[WKUserScriptalloc]

initWithSource:@"document.cookie = 'TeskCookieKey1=TeskCookieValue1';document.cookie = 'TeskCookieKey2=TeskCookieValue2';"

injectionTime:WKUserScriptInjectionTimeAtDocumentStartforMainFrameOnly:NO];

// again, use stringWithFormat: in the above line to inject your values programmatically

[userContentControlleraddUserScript:cookieScript];

WKWebViewConfiguration* webViewConfig = WKWebViewConfiguration.new;

webViewConfig.userContentController= userContentController;

WKWebView* webView = [[WKWebViewalloc]initWithFrame:CGRectMake(/*set your values

5.WKWebView与js通信

iOS 8 引入WKWebView,WKWebView不支持JavaScriptCore的方式但提供message handler的方式为JavaScript与Objective-C通信.

在Objective-C中使用WKWebView的以下方法调用JavaScript:

- (void)evaluateJavaScript:(NSString *)javaScriptString

completionHandler:(void (^)(id, NSError *))completionHandler

如果JavaScript代码出错, 可以在completionHandler进行处理.

在Objective-C中注册 message handler:

// WKScriptMessageHandler protocol?

- (void)userContentController:(WKUserContentController *)userContentController

didReceiveScriptMessage:(WKScriptMessage *)message

{

NSLog(@"Message: %@", message.body);

}

[userContentController addScriptMessageHandler:handler name:@"myName"];

在JavaScript将信息发给Objective-C:

// window.webkit.messageHandlers..postMessage();?

function postMyMessage()? {?

var message = { 'message' : 'Hello, World!', 'numbers' : [ 1, 2, 3 ] };?

window.webkit.messageHandlers.myName.postMessage(message);?

}