NSString *jsStr = @"执行的JS代码";
[webView stringByEvaluatingJavaScriptFromString:jsStr];

[webView evaluateJavaScript:@"执行的JS代码" completionHandler:^(id _Nullable response, NSError * _Nullable error) {}];

#import <Foundation/Foundation.h>
#import <JavaScriptCore/JavaScriptCore.h>

@protocol JSNativeProtocol <JSExport>

- (NSDictionary *)QRCodeScan:(NSDictionary *)param;

@end

@interface AppJSModel : NSObject <JSNativeProtocol>

@end


#import "AppJSModel.h"

@implementation AppJSModel
- (NSDictionary *)QRCodeScan:(NSDictionary *)param {
    NSLog(@"param: %@",param);
    return @{@"name":@"jack"};
}
@end

import './App.css';
import { useState } from 'react';

function OriginalWebViewApp() {
    const[name, setName] = useState('')
 
    // 0.公共
    //原生发消息给JS，JS的回调
    window.qrResult = (res)=>{
      setName(res)
      return '-------: '+res
    }
    // scheme拦截
    const localPostion = () => {
      window.location.href = 'position://localPosition?name=jack&age=20'
    }

    // 2.UIWebView的交互
    //js发消息给原生
    const qrActionOnAppModel = () => {
      const res = window.appModel.QRCodeScan({"name":"value"})
      alert(res.name)
    }
    const showAlert = () => {
      window.showAlert()
    }
   
   
    return (
      <div className="App">
        <div>------------------公共------------------</div>
          <div><a href='position://abc?name=jack' style={{color:'white'}}>scheme拦截1：定位</a></div>
          <button onClick={localPostion}>scheme拦截2</button>
          <div>
           原生执行代码的结果：{name}
          </div>
   
          <div>------------------UIWebView------------------</div>
          <button onClick={qrActionOnAppModel}>点击扫码</button>
          <button onClick={showAlert}>弹窗</button>
      </div>
    )
}

export default OriginalWebViewApp

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    JSContext *jsContext = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
    
    AppJSModel *jsModel = [AppJSModel new];
    jsContext[@"appModel"] = jsModel;
    jsContext[@"showAlert"] = ^(){
        dispatch_async(dispatch_get_main_queue(), ^{
            UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"请输入支付信息" message:@"" preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction* defaultAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
            [alert addAction:defaultAction];
            UIAlertAction* cancleAction = [UIAlertAction actionWithTitle:@"Cancle" style:UIAlertActionStyleCancel handler:nil];
            [alert addAction:cancleAction];
            
            [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
                textField.placeholder=@"请输入用户名";
            }];
            [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
                textField.placeholder=@"请输入支付密码";
                textField.secureTextEntry=YES;
            }];
            
            [self presentViewController:alert animated:YES completion:nil];
        });
    };
}

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    if ([request.URL.scheme isEqualToString:@"position"]) {
        //自定义处理定位scheme
        JSContext *jsContext = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
        NSString *jsCode = @"qrResult('杭州，之江')";
        [jsContext evaluateScript:jsCode];
        return NO;
    }
    
    return YES;
}

import './App.css';
import { useState } from 'react';

function OriginalWebViewApp() {
    const[name, setName] = useState('')
 
    // 0.公共
    //原生发消息给JS，JS的回调
    window.qrResult = (res)=>{
      setName(res)
      return '-------: '+res
    }
    // scheme拦截
    const localPostion = () => {
      window.location.href = 'position://localPosition?name=jack&age=20'
    }
   
    // 1.WKWebView的交互
    //js发消息给原生
    const qrAction = () => {
      window.webkit.messageHandlers.QRCodeScan.postMessage({"name":"value"})
    }
   
   
    return (
      <div className="App">
        <div>------------------公共------------------</div>
          <div><a href='position://abc?name=jack' style={{color:'white'}}>scheme拦截1：定位</a></div>
          <button onClick={localPostion}>scheme拦截2</button>
          <div>
           原生执行代码的结果：{name}
          </div>
   
          <div>------------------WKWebView------------------</div>
          <button onClick={qrAction}>点击扫描</button>
      </div>
    )
}

export default OriginalWebViewApp

override func viewDidLoad() {
    super.viewDidLoad()
    
    // WKWebViewConfiguration: 用于配置WKWebView的属性和行为, 常见的操作有
    let webViewConfiguration = WKWebViewConfiguration()
    
    //1.配置WKUserContentController,管理WKUserScript(cookie脚本)和WKScriptMessageHandler原生与JS的交互
    let userContentController = WKUserContentController()
    webViewConfiguration.userContentController = userContentController
    //添加WKScriptMessageHandler脚本处理
    userContentController.add(self, name: "QRCodeScan")
    //添加WKUserScript，injectionTime注入时机为atDocumentStart页面加载时在，forMainFrameOnly不只在主框架中注入，所有的框架都注入。
    let cookieScript = WKUserScript(source: "document.cookie = 'cookieName=cookieValue; domain=example.com; path=/';", injectionTime: .atDocumentStart, forMainFrameOnly: false)
    userContentController.addUserScript(cookieScript)
    
    //2.自定义处理网络，处理Scheme为position的定位网络操作
    webViewConfiguration.setURLSchemeHandler(self, forURLScheme: "position")
    
    //3.偏好配置WKPreferences,设置网页缩放，字体
    let preferences = WKPreferences()
    preferences.minimumFontSize = 10
    if #available(iOS 14, *) {
        let webpagePreferences = WKWebpagePreferences()
        webpagePreferences.allowsContentJavaScript = true
        webViewConfiguration.defaultWebpagePreferences = webpagePreferences
    } else {
        preferences.javaScriptEnabled = true
    }
    preferences.javaScriptCanOpenWindowsAutomatically = true
    webViewConfiguration.preferences = preferences
    
    //4.多媒体设置，设置视频自动播放，画中画，逐步渲染
    webViewConfiguration.allowsInlineMediaPlayback = true
    webViewConfiguration.allowsPictureInPictureMediaPlayback = true
    webViewConfiguration.allowsAirPlayForMediaPlayback = true
    webViewConfiguration.suppressesIncrementalRendering = true
    
    
    //5.cookie设置
    //WKWebView中HTTPCookieStorage.shared单例默认管理着所有的cookie，一般无需我们做额外的操作，如果想单独添加一个cookie,可以把创建的cookie放置到HTTPCookieStorage.shared中即可。
    //创建cookie对象
    let properties = [
        HTTPCookiePropertyKey.name: "cookieName",
        HTTPCookiePropertyKey.value: "cookieValue",
        HTTPCookiePropertyKey.domain: "example.com",
        HTTPCookiePropertyKey.path: "/",
        HTTPCookiePropertyKey.expires: NSDate(timeIntervalSinceNow: 31556926)
    ] as [HTTPCookiePropertyKey : Any]
    let cookie = HTTPCookie(properties: properties)!
    // 将cookie添加到cookie storage中
    HTTPCookieStorage.shared.setCookie(cookie)

    
    webView = WKWebView(frame: .zero, configuration: webViewConfiguration)
    webView.uiDelegate = self
    webView.navigationDelegate = self
    self.view.addSubview(webView)
    
    loadURL(urlString: "http://localhost:3000/")
}

//WKScriptMessageHandler
extension H5WKWebViewContainerController {
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        if message.name == "QRCodeScan" {
            print(message)
            
            //JS回调，原生处理完后，通知JS结果
            //原生给js的回调事件 会通过”原生调用js“方式放入到js执行环境的messageQueue中
            let script = "qrResult('jack')"
            message.webView?.evaluateJavaScript(script,completionHandler: { res, _ in
                print(res)
            })
            
        }
    }
}

// 自定义处理网络请求Scheme
// WKURLSchemeHandler 的 Delegate
extension H5WKWebViewContainerController {
    func webView(_ webView: WKWebView, start urlSchemeTask: WKURLSchemeTask) {
        if urlSchemeTask.request.url?.scheme == "position" {
            //自定义处理定位scheme
            webView.evaluateJavaScript("qrResult('杭州，之江')")
        }
        print(webView)
    }
    
    func webView(_ webView: WKWebView, stop urlSchemeTask: WKURLSchemeTask) {
        print(webView)
    }
}

- (void)registerHandler:(NSString *)handlerName handler:(WVJBHandler)handler；

- (void)callHandler:(NSString *)handlerName data:(id)data

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    WKWebView *wkWebView = [[WKWebView alloc] initWithFrame:self.view.frame];
    wkWebView.navigationDelegate = self;
    [self.view addSubview:wkWebView];
    
    [WebViewJavascriptBridge enableLogging];
    self.bridge = [WebViewJavascriptBridge bridgeForWebView:wkWebView];
    
    // 在JS上下文中注册callOC方法
    [self.bridge registerHandler:@"testObjcCallback" handler:^(id data, WVJBResponseCallback responseCallback) {
        NSLog(@"收到了JS的调用");
        responseCallback(@"Object-C Received");
    }];
    
    // iOS调用JS
    [self.bridge callHandler:@"testJavascriptHandler" data:@{@"state":@"before ready"}];
    
    NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://localhost:3000/"]];
    [wkWebView loadRequest:req];
}

import React from "react"

function setupWebViewJavascriptBridge(callback) {
  if (window.WebViewJavascriptBridge) { return callback(window.WebViewJavascriptBridge); }
  if (window.WVJBCallbacks) { return window.WVJBCallbacks.push(callback); }
  window.WVJBCallbacks = [callback];
  var WVJBIframe = document.createElement('iframe');
  WVJBIframe.style.display = 'none';
  WVJBIframe.src = 'https://__bridge_loaded__';
  document.documentElement.appendChild(WVJBIframe);
  setTimeout(function() { document.documentElement.removeChild(WVJBIframe) }, 0)
}


function WebViewJavaScriptBridgeApp() {

    return (
        <div className="WebViewJavaScriptBridgeApp">
          <div>---------WebViewJavaScript---------</div>
          <div id="buttons"></div>
          <div id="log"></div>
          <div>
          {
              setupWebViewJavascriptBridge(function(bridge) {
                var uniqueId = 1
                function log(message, data) {
                  var log = document.getElementById('log')
                  var el = document.createElement('div')
                  el.className = 'logLine'
                  el.innerHTML = uniqueId++ + '. ' + message + ':<br/>' + JSON.stringify(data)
                  if (log.children.length) { log.insertBefore(el, log.children[0]) }
                  else { log.appendChild(el) }
                }
            
                bridge.registerHandler('testJavascriptHandler', function(data, responseCallback) {
                  log('ObjC called testJavascriptHandler with', data)
                  var responseData = { 'Javascript Says':'Right back atcha!' }
                  log('JS responding with', responseData)
                  if (responseCallback !== undefined) {
                     responseCallback(responseData)
                  }
                })
            
                document.body.appendChild(document.createElement('br'))
                if (document.getElementById('buttons') === null) {
                  setTimeout(function() {
                    document.getElementById('buttons').innerHTML = ""
                    var callbackButton = document.getElementById('buttons').appendChild(document.createElement('button'))
                    callbackButton.innerHTML = 'js 调用 OC方法'
                    callbackButton.onclick = function(e) {
                      e.preventDefault()
                      log('JS calling handler "testObjcCallback"')
                      bridge.callHandler('testObjcCallback', {'foo': 'bar'}, function(response) {
                        log('JS got response', response)
                      })
                    }
                  },0)
                }
                
              })  
          }
          </div>
        </div>
      )
}

export default WebViewJavaScriptBridgeApp

window.WebViewJavascriptBridge = {
    // 保存js注册的处理函数：messageHandlers[handlerName] = handler;
    registerHandler: registerHandler,
    //JS调用OC方法
    callHandler: callHandler,
    disableJavscriptAlertBoxSafetyTimeout: disableJavscriptAlertBoxSafetyTimeout,
    //JS调用OC的消息队列
    _fetchQueue: _fetchQueue,
    //JS处理OC过来的方法调用。
    _handleMessageFromObjC: _handleMessageFromObjC
};

function _fetchQueue() {
    var messageQueueString = JSON.stringify(sendMessageQueue);
    sendMessageQueue = [];
    return messageQueueString;
}

NSMutableDictionary* message = [NSMutableDictionary dictionary];
message[@"data"] = data;
    
NSString* callbackId = [NSString stringWithFormat:@"objc_cb_%ld", ++_uniqueId];
self.responseCallbacks[callbackId] = [responseCallback copy];
message[@"callbackId"] = callbackId;
message[@"handlerName"] = handlerName;

@interface WebViewJavascriptBridgeBase : NSObject
// 在成员变量中定义字段responseCallbacks
@property (strong, nonatomic) NSMutableDictionary* responseCallbacks;
@end


//发送消息时，保存回调ID：回调函数键值对。
- (void)sendData:(id)data responseCallback:(WVJBResponseCallback)responseCallback handlerName:(NSString*)handlerName {
    NSMutableDictionary* message = [NSMutableDictionary dictionary];
    
    if (data) {
        message[@"data"] = data;
    }
    
    if (responseCallback) {
        NSString* callbackId = [NSString stringWithFormat:@"objc_cb_%ld", ++_uniqueId];
        self.responseCallbacks[callbackId] = [responseCallback copy];
        message[@"callbackId"] = callbackId;
    }
    
    if (handlerName) {
        message[@"handlerName"] = handlerName;
    }
    [self _queueMessage:message];
}

// 在JS全局上下文中定义对象responseCallbacks
var responseCallbacks = {};
function _doSend(message, responseCallback) {
    if (responseCallback) {
        var callbackId = 'cb_'+(uniqueId++)+'_'+new Date().getTime();
        //保存回调id:回调方法，键值对
        responseCallbacks[callbackId] = responseCallback;
        message['callbackId'] = callbackId;
    }
    sendMessageQueue.push(message);
    messagingIframe.src = CUSTOM_PROTOCOL_SCHEME + '://' + QUEUE_HAS_MESSAGE;
}

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    if (webView != _webView) { return; }
    NSURL *url = navigationAction.request.URL;
    __strong typeof(_webViewDelegate) strongDelegate = _webViewDelegate;

    
    if ([_base isWebViewJavascriptBridgeURL:url]) {
        if ([_base isBridgeLoadedURL:url]) {
            //iOS原生进行js交互环境注入
            [_base injectJavascriptFile];
        } else if ([_base isQueueMessageURL:url]) {
            [self WKFlushMessageQueue];
        } else {
            [_base logUnkownMessage:url];
        }
        decisionHandler(WKNavigationActionPolicyCancel);
        return;
    }
    
    if (strongDelegate && [strongDelegate respondsToSelector:@selector(webView:decidePolicyForNavigationAction:decisionHandler:)]) {
        [_webViewDelegate webView:webView decidePolicyForNavigationAction:navigationAction decisionHandler:decisionHandler];
    } else {
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}