原生与页面交互，在其中一边登录过了，另外一边需要用cookie来验证。

如果是要整个WKWebView需要cookie则用这个方法从NSHTTPCookieStorage中拿到一开始存储到是cookie

 WKWebViewConfiguration *webConfig = [[WKWebViewConfiguration alloc] init];
    // 设置偏好设置
    webConfig.preferences = [[WKPreferences alloc] init];
    // 默认为0
    webConfig.preferences.minimumFontSize = 10;
    // 默认认为YES
    webConfig.preferences.javaScriptEnabled = YES;
    // 在iOS上默认为NO，表示不能自动通过窗口打开
    webConfig.preferences.javaScriptCanOpenWindowsAutomatically = NO;
    
    // web内容处理池
    webConfig.processPool = [[WKProcessPool alloc] init];
    // 将所有cookie以document.cookie = 'key=value';形式进行拼接

    /* **********在此处获取返回的cookie********* */
    NSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];
    NSMutableString *cookieValue = [NSMutableString stringWithFormat:@""];
    NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    
    for (NSHTTPCookie *cookie in [cookieJar cookies]) {
        [cookieDic setObject:cookie.value forKey:cookie.name];
    }
    
    // cookie重复，先放到字典进行去重，再进行拼接
    for (NSString *key in cookieDic) {
        NSString *appendString = [NSString stringWithFormat:@"document.cookie = '%@=%@';", key, [cookieDic valueForKey:key]];
        [cookieValue appendString:appendString];
    }
    
//    NSString *cookieValue = @"document.cookie = 'fromapp=ios';document.cookie = 'channel=appstore';";
    
    // 加cookie给h5识别，表明在ios端打开该地址
    WKUserContentController* userContentController = WKUserContentController.new;
    WKUserScript * cookieScript = [[WKUserScript alloc]
                                   initWithSource: cookieValue
                                   injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
    [userContentController addUserScript:cookieScript];
    webConfig.userContentController = userContentController;
    
    _webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT-64) configuration:webConfig];
    _webView.UIDelegate = self;
    _webView.navigationDelegate = self;

如果是只是单个页面URL需要cookie则用这个方法从NSHTTPCookieStorage中拿到一开始存储到是cookie

   NSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];
    NSMutableString *cookieValue = [NSMutableString stringWithFormat:@""];
    NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    
    for (NSHTTPCookie *cookie in [cookieJar cookies]) {
        [cookieDic setObject:cookie.value forKey:cookie.name];
    }
    
    // cookie重复，先放到字典进行去重，再进行拼接
    for (NSString *key in cookieDic) {
        NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [cookieDic valueForKey:key]];
        [cookieValue appendString:appendString];
    }
    
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:WeiXiShanHuoLink]];
    [request addValue:cookieValue forHTTPHeaderField:@"Cookie"];

    [_webView loadRequest:request];
    [self.view addSubview:_webView];