1、首先导入第三方框架WebViewJavascriptBridge

WKWebView的用法

 WKWebView* webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
    webView.navigationDelegate = self;
    webView.UIDelegate = self;
    [webView.configuration.preferences setValue:@"TRUE" forKey:@"allowFileAccessFromFileURLs"];
    webView.scrollView.bounces = NO;
    self.webView = webView;
    [self.view addSubview:webView];
//WebViewJavascriptBridge的创建方式
    [WebViewJavascriptBridge enableLogging];
    _bridge = [WebViewJavascriptBridge bridgeForWebView:webView];
    [_bridge setWebViewDelegate:self];

2、JS调用OC的方法及响应

[_bridge registerHandler:@"App_scanBarCode" handler:^(id data, WVJBResponseCallback responseCallback) {
        NSLog(@"testObjcCallback called: %@", data);
//        responseCallback(@"Response from testObjcCallback");
        
        XYBShapeCodeViewController *vc = [[XYBShapeCodeViewController alloc] init];
        vc.shapecodevcType = XYBShapeCodeVCTypeCustom;
        vc.codeBlock = ^(NSString * msg) {
            [weakSelf callHandler:msg];
        };
        
        [weakSelf.navigationController pushViewController:vc animated:YES];
    }];

第一个参数（字符串）：JS调用的方法名
block里面的参数：data是JS传过来的参数
3、OC调用JS的方法

[_bridge callHandler:@"App_getUserInfo" data:@{@"username":user.username,@"merCode":user.merCode} responseCallback:^(id responseData) {
        
    }];

第一个参数是需要调用的JS里面的方法名
第二个参数是需要给该方法传递的参数
第三个参数是JS回调block