WKWebView是支持ios8以后的，用起来比 uiwebview方便，而且内存占用率少

pragma mark – WKNavigationDelegate

//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 didFailNavigation:(WKNavigation )navigation withError:(NSError *)error {

}

//接收到服务器 跳转请求之后调用，即从一个h5 进入另一个h5

- (void)webView:(WKWebView )webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation )navigation {

}

//在收到响应之前，决定是否跳转

- (void)webView:(WKWebView )webView decidePolicyForNavigationAction:(WKNavigationAction )navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {

decisionHandler(WKNavigationActionPolicyAllow);

}

//在发送请求之前 ，决定是否跳转

- (void)webView:(WKWebView )webView decidePolicyForNavigationResponse:(WKNavigationResponse )navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {

decisionHandler(WKNavigationResponsePolicyAllow);

}

上边的都比较简单，下边讲一下js 调用oc的方法

js中 window.alert(‘找到’+count+’张图’)

则会调用

- (void)webView:(WKWebView )webView runJavaScriptAlertPanelWithMessage:(NSString )message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {

NSLog(@”alert %@”,message);

completionHandler();

}

window.confirm(‘找到’+count+’张图’)

会调用

- (void)webView:(WKWebView )webView runJavaScriptConfirmPanelWithMessage:(NSString )message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {

NSLog(@”confirm %@”,message);

completionHandler(YES);//yes 为确认，no 为取消

}

js 中的 window.confirm(‘找到’+count+’张图’)会调用

- (void)webView:(WKWebView )webView runJavaScriptTextInputPanelWithPrompt:(NSString )prompt defaultText:(NSString )defaultText initiatedByFrame:(WKFrameInfo )frame completionHandler:(void (^)(NSString * str))completionHandler {

//输入 文字，并通过completionhandler带回去

}

如果是js自己的命名的方法，则需要统一一下

NSString * jsMessage = @”window.webkit.messageHandlers.flut.postMessage(‘123456’)”;

其中flut是和h5定义的名字， 123456则是h5 想要传给你的值，可以是对象，数组，字典均可。

pragma mark – WKScriptMessageHandler

(void)userContentController:(WKUserContentController )userContentController didReceiveScriptMessage:(WKScriptMessage )message {

NSLog(@”message.name %@ message.body %@”,message.name,message.body);

}

在ios中则会调用上边的方法，通过解析之后再调用

// [self.webView evaluateJavaScript:confirmjs completionHandler:^(id object, NSError * _Nullable error) {

// }］；类似的js方法，即可实现和h5的交互