IOS-WKWebView的使用以及Cookie的处理

其实和UIWebView的用法没什么区别，但是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。

WKWebView的代理方法：

WKNavigationDelegate代理的使用：

该代理提供的方法，可以用来追踪加载过程（页面开始加载、加载完成、加载失败）、决定是否执行跳转。// 页面开始加载时调用- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation;// 当内容开始返回时调用- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation;// 页面加载完成之后调用- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation;// 页面加载失败时调用- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation;

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）

// 接收到服务器跳转请求之后调用- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation;// 在收到响应后，决定是否跳转- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;// 在发送请求之前，决定是否跳转- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;

代理方法的展开：

#pragma mark - WKNavigationDelegate -/** *  页面开始加载时调用 * *  @param webView    实现该代理的webview *  @param navigation 当前navigation */- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {    NSLog(@"%s", __FUNCTION__);}/** *  当内容开始返回时调用 * *  @param webView    实现该代理的webview *  @param navigation 当前navigation */- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {    NSLog(@"%s", __FUNCTION__);}/** *  页面加载完成之后调用 * *  @param webView    实现该代理的webview *  @param navigation 当前navigation */- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {    self.progressView.alpha = 0;    NSLog(@"%s", __FUNCTION__);}/** *  加载失败时调用 * *  @param webView    实现该代理的webview *  @param navigation 当前navigation *  @param error      错误 */- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error {    NSLog(@"%s", __FUNCTION__);}/** *  接收到服务器跳转请求之后调用 * *  @param webView      实现该代理的webview *  @param navigation   当前navigation */- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation {    NSLog(@"%s", __FUNCTION__);}/** *  在收到响应后，决定是否跳转 * *  @param webView            实现该代理的webview *  @param navigationResponse 当前navigation *  @param decisionHandler    是否跳转block */- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {    NSString *clickUrl = [navigationResponse.response.URL absoluteString];    self.barView.addressLabel.text = clickUrl;    NSLog(@"%@", navigationResponse.response.URL);    decisionHandler(WKNavigationResponsePolicyAllow);}/** *  在发送请求之前，决定是否跳转 * *  @param webView          实现该代理的webview *  @param navigationAction 当前navigation *  @param decisionHandler  是否调转block */- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {    decisionHandler(WKNavigationActionPolicyAllow);}

WKUIDelegate代理的使用：

// 创建一个新的WebView- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;

剩下三个代理方法全都是与界面弹出提示框相关的，针对于web界面的三种提示框（警告框、确认框、输入框）分别对应三种代理方法。下面只举了警告框的例子。

#pragma mark - WKUIDelegate/** *  web界面中有弹出警告框时调用 * *  @param webView           实现该代理的webview *  @param message           警告框中的内容 *  @param frame             主窗口 *  @param completionHandler 警告框消失调用 */- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"温馨提示" message:message preferredStyle:(UIAlertControllerStyleAlert)];    UIAlertAction *trueAction = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleCancel) handler:^(UIAlertAction *action) {    }];    [alertController addAction:trueAction];    [self presentViewController:alertController animated:YES completion:nil];    completionHandler(YES);}- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString *))completionHandler {} 

WKScriptMessageHandler代理的使用：

这个协议中包含一个必须实现的方法，这个方法是提高App与web端交互的关键，它可以直接将接收到的JS脚本转为OC或Swift对象。（当然，在UIWebView也可以通过“曲线救国”的方式与web进行交互，著名的Cordova框架就是这种机制）。

#pragma mark - WKScriptMessageHandler- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {    NSLog(@"%@", message);}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}

WKWebView加载JS：

// 图片缩放的js代码NSString *js = @"var count = document.images.length;for (var i = 0; i < count; i++) {var image = document.images[i];image.style.width=320;};window.alert('找到' + count + '张图');";// 根据JS字符串初始化WKUserScript对象WKUserScript *script = [[WKUserScript alloc] initWithSource:js injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];// 根据生成的WKUserScript对象，初始化WKWebViewConfigurationWKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];[config.userContentController addUserScript:script];_webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];[_webView loadHTMLString:@""baseURL:nil];[self.view addSubview:_webView];

WKWebView的Cookie问题：

<参考链接如下几个>
WKWebView从入门到趟坑：
http://www.jianshu.com/p/90a90bd13aac

iOS开发WKWebView Cookie的读取与写入,与UIWebView的Cookie共享：
http://www.skyfox.org/ios-wkwebview-cookie-opration.html