简单介绍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

[objc]view plaincopyprint?

- (void)webView:(WKWebView*)webViewdidStartProvisionalNavigation:(WKNavigation*)navigation {// 类似UIWebView的 -webViewDidStartLoad:

NSLog(@"didStartProvisionalNavigation");

[UIApplicationsharedApplication].networkActivityIndicatorVisible=YES;

}

- (void)webView:(WKWebView*)webViewdidCommitNavigation:(WKNavigation*)navigation {

NSLog(@"didCommitNavigation");

}

- (void)webView:(WKWebView*)webViewdidFinishNavigation:(WKNavigation*)navigation {// 类似 UIWebView 的 －webViewDidFinishLoad:

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:

NSLog(@"didFailProvisionalNavigation");

}

- (void)webView:(WKWebView*)webViewdecidePolicyForNavigationResponse:(WKNavigationResponse*)navigationResponsedecisionHandler:(void(^)(WKNavigationResponsePolicy))decisionHandler {

decisionHandler(WKNavigationResponsePolicyAllow);

}

- (void)webView:(WKWebView*)webViewdecidePolicyForNavigationAction:(WKNavigationAction*)navigationActiondecisionHandler:(void(^)(WKNavigationActionPolicy))decisionHandler {

// 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

[objc]view plaincopyprint?

- (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

[objc]view plaincopyprint?

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

[objc]view plaincopyprint?

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

[objc]view plaincopyprint?

- (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

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

[objc]view plaincopyprint?

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];

[objc]view plaincopyprint?

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*/)configuration:webViewConfig];