pragma mark -这里要事先注入 和 h5 约定的方法名称
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
    NSArray *methodArr = @[@"startMiniProgram",@"getDataList",@"click"];//这里要事先注入 和 h5 约定的方法名称
    [methodArr enumerateObjectsUsingBlock:^(NSString *methodStr, NSUInteger idx, BOOL * _Nonnull stop) {
        [configuration.userContentController addScriptMessageHandler:self name:methodStr];
    }];
    WKPreferences *preferences = [WKPreferences new];
    preferences.javaScriptCanOpenWindowsAutomatically = YES;
    configuration.preferences = preferences;

webView要添加一句代码的监听

        [webView.configuration.userContentController addScriptMessageHandler:self name:[iSecWebViewBridge iSecWebviewHttpJSMethodString]];

之后在这个方法里写监听到按钮点击

- (void)userContentController:(nonnull WKUserContentController *)userContentController didReceiveScriptMessage:(nonnull WKScriptMessage *)message {
    NSLog(@"%@:%@",message.name,message.body);
//通过判断message.name 来判断是点击了那个按钮，做一些处理
//message.body 是H5传过来的参数
     if ([message.name contains:@"startMiniProgram"]) {
        
  
    } else if ([message.name contains:@"getDataList"]){

  }
}

H5调用原生，H5给原生传值
H5写法，这里h5 跟原生代码之间传递参数要用字符串

<div class="mui-card-header mui-card-media" style="height:32vw;background-image:url(image/hd-3.jpeg)" onclick="getDataByType(data)"></div>
<div class="mui-card-header mui-card-media" style="height:32vw;background-image:url(image/hd-3.jpeg)" onclick="startMiniProgram(paraStr1,paraStr2)"></div>

function startMiniProgram(obje, fun) {
    if (/(iPhone|iPad|iPod|iOS)/i.test(window.navigator.userAgent)) {                   
             window.webkit.messageHandlers.startMiniProgram.postMessage(obj, fun);
    } else {
    window.Android.startMiniProgram(obj, fun);
    }   
}

function getDataByType(data) {
    if (/(iPhone|iPad|iPod|iOS)/i.test(window.navigator.userAgent)) {                   
             window.webkit.messageHandlers.getDataByType.postMessage(data);
    } else {
    window.Android.getDataByType(data);
    }   
}

OC代码调用H5，给原生传值，同样也只能传字符串，如果传json类型参数要传成字符串

  //section js方法名   ticketNo 参数
    NSString *str = [NSString stringWithFormat:@"%@(%@)",section,ticketNo];
    [self.webView evaluateJavaScript:str completionHandler:^(id _Nullable complete, NSError * _Nullable error) {
        if (complete) {
            
        }
    }];