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iOS UIWebView 和 WKWebView 的 cook

iOS UIWebView 和 WKWebView 的 cook

作者: _水畔竹汐 | 来源:发表于2018-09-01 16:48 被阅读0次

    Cookie简介

    说到Cookie,或许有些小伙伴会比较陌生,有些小伙伴会比较熟悉。如果项目中,所有页面都是纯原生来实现的话,一般Cookie这个东西或许我们永远也不会接触到。但是,这里还是要说一下Cookie,因为它真的很重要,由它产生的一些坑也很多。

    Cookie 在 web中应用比较多,主要是记录一个状态,比如我在网页上登录了,我就可以拿到网页登录后 Cookie,下次再 Cookie 的生效期内我就可以不用输入账号密码,直接跳转登录状态,在App中,Cookie最常用的也就是维持登录状态了.因为笔者最近就在做这个,其中也遇到过很多坑,这里说先踩坑和用法

    iOS Cookie 的管理

    • NSHTTPCookie和NSHTTPCookieStorage

    iOS中进行HTTP网络请求Cookie管理主要由两个类负责,一个类是NSHTTPCookieStorage类,一个是NSHTTPCookie类。

    NSHTTPCookieStorage

    NSHTTPCookieStorage类采用单例的设计模式,其中管理着所有HTTP请求的Cookie信息
    官方解释:NSHTTPCookieStorage 是一个用来管理 cookie 存储的单例。一个 NSHTTPCookie 单例代表一个 cookie。通常来讲,cookie 可以在应用间共享,并且在进程之间保持同步。 对于单进程,Session cookies (这里的 cookie 对象的 isSessionOnly 方法返回 YES)是局部的并且不能被共享。

    **常用方法**
    // 获取单例对象
    + (NSHTTPCookieStorage *)sharedHTTPCookieStorage;
    
    // 所有Cookie数据数组 其中存放NSHTTPCookie对象
    @property (nullable , readonly, copy) NSArray<NSHTTPCookie *> *cookies;
    
    // 手动设置一条Cookie数据
    - (void)setCookie:(NSHTTPCookie *)cookie;
    
    // 删除某条Cookie信息
    - (void)deleteCookie:(NSHTTPCookie *)cookie;
    
    // 删除某个时间后的所有Cookie信息 iOS8后可用
    - (void)removeCookiesSinceDate:(NSDate *)date NS_AVAILABLE(10_10, 8_0);
    
    // 获取某个特定URL的所有Cookie数据
    - (nullable NSArray<NSHTTPCookie *> *)cookiesForURL:(NSURL *)URL;
    
    // 为某个特定的URL设置Cookie
    - (void)setCookies:(NSArray<NSHTTPCookie *> *)cookies forURL:(nullable NSURL *)URL mainDocumentURL:(nullable NSURL *)mainDocumentURL;
    
    // Cookie数据的接收协议
    枚举如下:
    typedef NS_ENUM(NSUInteger, NSHTTPCookieAcceptPolicy) {
        NSHTTPCookieAcceptPolicyAlways,//接收所有Cookie信息
        NSHTTPCookieAcceptPolicyNever,//不接收所有Cookie信息
        NSHTTPCookieAcceptPolicyOnlyFromMainDocumentDomain//只接收主文档域的Cookie信息
    };
    @property NSHTTPCookieAcceptPolicy cookieAcceptPolicy;
    
    系统下面的两个通知与Cookie管理有关:
    据说,在Mac OS是cookie可以共享的(Session cookies 不能共享),在Mac OS app中更改cookie的接收策略会影响到其他正在运行的在使用cookie storage的app.这时NSHTTPCookieStorage会发出两个通知:
    // Cookie数据的接收协议改变时发送的通知
    FOUNDATION_EXPORT NSString * const NSHTTPCookieManagerAcceptPolicyChangedNotification;
    // 管理的Cookie数据发生变化时发送的通知
    FOUNDATION_EXPORT NSString * const NSHTTPCookieManagerCookiesChangedNotification;
    
    

    NSHTTPCookie介绍

    NSHTTPCookie是具体的HTTP请求Cookie数据对象.

    // 下面两个方法用于对象的创建和初始化 都是通过字典进行键值设置
    - (nullable instancetype)initWithProperties:(NSDictionary<NSString *, id> *)properties;
    + (nullable NSHTTPCookie *)cookieWithProperties:(NSDictionary<NSString *, id> *)properties;
    
    // 返回Cookie数据中可用于添加HTTP头字段的字典
    + (NSDictionary<NSString *, NSString *> *)requestHeaderFieldsWithCookies:(NSArray<NSHTTPCookie *> *)cookies;
    
    // 从指定的响应头和URL地址中解析出Cookie数据
    + (NSArray<NSHTTPCookie *> *)cookiesWithResponseHeaderFields:(NSDictionary<NSString *, NSString *> *)headerFields forURL:(NSURL *)URL;
    
    // Cookie数据中的属性字典
    @property (nullable, readonly, copy) NSDictionary<NSString *, id> *properties;
    
    // 请求响应的版本
    @property (readonly) NSUInteger version;
    
    // 请求相应的名称
    @property (readonly, copy) NSString *name;
    
    // 请求相应的值
    @property (readonly, copy) NSString *value;
    
    // 过期时间
    @property (nullable, readonly, copy) NSDate *expiresDate;
    
    // 请求的域名
    @property (readonly, copy) NSString *domain;
    
    //请求的路径
    @property (readonly, copy) NSString *path;
    
    // 是否是安全传输
    @property (readonly, getter=isSecure) BOOL secure;
    
    // 是否只发送HTTP的服务
    @property (readonly, getter=isHTTPOnly) BOOL HTTPOnly;
    
    // 响应的文档
    @property (nullable, readonly, copy) NSString *comment;
    
    // 相应的文档URL
    @property (nullable, readonly, copy) NSURL *commentURL;
    
    // 服务端口列表
    @property (nullable, readonly, copy) NSArray<NSNumber *> *portList;
    
    

    HTTP cookie的属性键

    属性 解读
    NSHTTPCookieName Cookie的名字
    NSHTTPCookieValue Cookie的值
    NSHTTPCookieOriginURL 和域名一样,NSHTTPCookieDomain或NSHTTPCookieOriginURL必须指定一个值
    NSHTTPCookieVersion 接收器的版本
    NSHTTPCookieDomain 域名
    NSHTTPCookiePath Cookie 存放路径
    NSHTTPCookieSecure Cookie是否只应通过安全通道发送,设置Cookie的secure属性为true。只会在HTTPS和SSL等安全协议中传输此类Cookie。默认为false
    NSHTTPCookieComment 包含Cookie的评论,只有有效的版本1的cookies或更高版本。 这头字段是可选的
    NSHTTPCookieCommentURL 接收器的评论URL
    NSHTTPCookieDiscard Cookie是否应在会议结束时丢弃NSString,字符串值必须是“true”或“假”。 这个字段是可选的。 默认为“假”,除非这是Cookie是第1版或以上,NSHTTPCookieMaximumAge未指定,在这种情况下,它被假定为“TRUE”
    NSHTTPCookieMaximumAge NSString对象,包含一个整数,在Cookie内保持最多几秒 。仅适用于第1版和更高版本的有效。 默认为“0”。 此字段是可选的
    NSHTTPCookiePort 接收机的端口
    • UIWebView的 Cookie 机制

    UIWebView 在浏览网页后会将网页中的 cookie 自动存入 NSHTTPCookieStorage 标准容器中,[NSHTTPCookieStorage sharedHTTPCookieStorage]这个单例管理,在后续访问中会将 cookie 自动带到 request 请求当中。并且在同一个app内多个UIWebView之间共享。

    • webView 中获取 cookie
    //加载成功
    - (void)webViewDidFinishLoad:(UIWebView *)webView {
        NSString *requestUrl = webView.request.URL.absoluteString;
        NSLog(@" requestUrl: %@",requestUrl);
    
    //设置原始 cookie 根据key 存储本地
        NSMutableArray *cookieArray = [[NSMutableArray alloc] init];
    
    //网页加载完成取出 cookies
        NSArray *nCookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
        NSHTTPCookie *cookie;
        for (id c in nCookies) {
            if ([c isKindOfClass:[NSHTTPCookie class]]) {
                cookie=(NSHTTPCookie *)c;
              //我这里是cookie存入字典中 去重
                if ([cookie value]) {
                    //如果 vaule 值不为 nil 存入字典中,
                    [self.mutableDic setValue:[cookie value] forKey:[cookie name]];
                  }
    //设置原始 cookie
                NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];
                [cookieProperties setObject:cookie.name forKey:NSHTTPCookieName];
                [cookieProperties setObject:cookie.value forKey:NSHTTPCookieValue];
                [cookieProperties setObject:cookie.domain forKey:NSHTTPCookieDomain];
                [cookieProperties setObject:cookie.path forKey:NSHTTPCookiePath];
                [cookieProperties setObject:[[NSDate date] dateByAddingTimeInterval:2629743] forKey:NSHTTPCookieExpires];
                [cookieArray addObject:cookieProperties];
    
                [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
            }
        }
    //cookie 存入本地
       [[NSUserDefaults standardUserDefaults] setObject:cookieArray forKey:@"cookieArray"];
            [[NSUserDefaults standardUserDefaults] synchronize];
    
    //下面 cookie 去重是为了得到 key=Value;形式的字符串,这里由于我有需求这样做,实际中下面可以忽略
            NSMutableString *cookieValue = [NSMutableString stringWithFormat:@""];
            // cookie重复,先放到字典进行去重,再进行拼接
            for (NSString *key in self.mutableDic) {
                NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [self.mutableDic valueForKey:key]];
                [cookieValue appendString:appendString];
            }
    NSLog(@"########################     %@        ####################",cookieValue);
    
    • 设置 cookie
     NSMutableArray* cookieDictionary = [[NSUserDefaults standardUserDefaults] valueForKey:@"cookieArray"];
            
            NSLog(@"cookie dictionary found is %@",cookieDictionary);
            
            if (cookieDictionary) {
                for (NSInteger i = 0; i < cookieDictionary.count; i++) {
                    
                    NSLog(@"cookie found is %@",[cookieDictionary objectAtIndex:i]);
                    
                    NSDictionary *cookieDic = [cookieDictionary objectAtIndex:i];
                    NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:cookieDic];
                    [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
                }
            }
        //设置请求之前加载 cookie 确保 cookie 在请求头之前设置
        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:self.URLString] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
    
        //加载网页
        [self.webView loadRequest:request];
    
    
    • 删除 cookie
    // 清空 cookie
    - (void)deleteCookie {
        // 清空 cookie
        NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
        NSArray *_tmpArray = [NSArray arrayWithArray:[cookieJar cookies]];
        for (id obj in _tmpArray) {
            [cookieJar deleteCookie:obj];
        }
    }
    
    • WKWebView 的 Cookie 机制

    NSURLCache和NSHTTPCookieStroage无法操作(WKWebView)WebCore进程的缓存和Cookie
    WKWebView实例将会忽略任何的默认网络存储器(NSURLCache, NSHTTPCookieStorage, NSCredentialStorage) 和一些标准的自定义网络请求类(NSURLProtocol,等等.),WKWebView实例不会把Cookie存入到App标准的的Cookie容器(NSHTTPCookieStorage)中,因为 NSURLSession/NSURLConnection等网络请求使用NSHTTPCookieStorage进行访问Cookie,所以不能访问WKWebView的Cookie,现象就是WKWebView存了Cookie,其他的网络类如NSURLSession/NSURLConnection却看不到。这是很多人的说法。
    还有一种是说法是通过实践发现 WKWebView 实例其实也会将 Cookie 存储于 NSHTTPCookieStorage 中,但存储时机有延迟,因为WKWebView内也有cookie的容器,而且每隔一段时间就和app侧NSHTTPCookieStorage进行同步,而且这个同步是进程级别的同步,而且这个同步是单向。
    至于以上两种说法,最终WKWebView Cookie 问题在于 WKWebView 发起的请求不会自动带上存储于 NSHTTPCookieStorage 容器中的 Cookie。

    • iOS11
      iOS11 的 API 可以解决该问题,只要是存在 WKHTTPCookieStore 里的 cookie,WKWebView 每次请求都会携带,存在 NSHTTPCookieStorage 的cookie,并不会每次都携带。于是会发生首次 WKWebView 请求不携带 Cookie 的问题。

    • ios 11 WKWebView cookie 的注入
      在执行 -[WKWebView loadReques:] 前将 NSHTTPCookieStorage 中的内容复制到 WKHTTPCookieStore 中,以此来达到 WKWebView Cookie 注入的目的。示例代码如下:

    [self copyNSHTTPCookieStorageToWKHTTPCookieStoreWithCompletionHandler:^{
                NSURL *url = [NSURL URLWithString:@"https://www.v2ex.com"];
                NSURLRequest *request = [NSURLRequest requestWithURL:url];
                [_webView loadRequest:request];
            }];
    
    
    - (void)copyNSHTTPCookieStorageToWKHTTPCookieStoreWithCompletionHandler:(nullable void (^)())theCompletionHandler; {
        NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
        WKHTTPCookieStore *cookieStroe = self.webView.configuration.websiteDataStore.httpCookieStore;
        if (cookies.count == 0) {
            !theCompletionHandler ?: theCompletionHandler();
            return;
        }
        for (NSHTTPCookie *cookie in cookies) {
            [cookieStroe setCookie:cookie completionHandler:^{
                if ([[cookies lastObject] isEqual:cookie]) {
                    !theCompletionHandler ?: theCompletionHandler();
                    return;
                }
            }];
        }
    }
    
    
    • ios11 之前
      注入 Cookie 就是从之前保存 cookie 的 NSHTTPCookieStorage 中取出相关 Cookie,然后在再次请求访问的时候在 request 中注入 Cookie。注入Cookie同样有多种方式。

    • 1.JS注入1

    //取出 storage 中的cookie并将其拼接成正确的形式
    NSArray<NSHTTPCookie *> *tmp = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];    
        NSMutableString *jscode_Cookie = [@"" mutableCopy];
        [tmp enumerateObjectsUsingBlock:^(NSHTTPCookie * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
            NSLog(@"%@   =  %@", obj.name, obj.value);
            [jscode_Cookie appendString:[NSString stringWithFormat:@"document.cookie =  '%@=%@';", obj.name, obj.value]];
        }];
    
    WKUserContentController* userContentController = WKUserContentController.new;
        WKUserScript * cookieScript = [[WKUserScript alloc] initWithSource: @"" injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
        
        [userContentController addUserScript:cookieScript];
        WKWebViewConfiguration* webViewConfig = WKWebViewConfiguration.new;
        webViewConfig.userContentController = userContentController;
    WKWebView * webView = [[WKWebView alloc] initWithFrame:CGRectMake(/*set your values*/) configuration:webViewConfig];
    
    • JS注入2
    - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
        [webView evaluateJavaScript:@"document.cookie ='TeskCookieKey1=TeskCookieValue1';" completionHandler:^(id result, NSError *error) {
            //...
        }];
    }
    
    
    • NSMutableURLRequest 注入Cookie
    NSURL *url = request.URL;
    NSMutableString *cookies = [NSMutableString string];
    NSMutableURLRequest *requestObj = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
        
    NSArray *tmp = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
    NSDictionary *dicCookies = [NSHTTPCookie requestHeaderFieldsWithCookies:tmp];
    NSString *cookie = [self readCurrentCookie];
    [requestObj setValue:cookie forHTTPHeaderField:@"Cookie"];
    [_webView loadRequest:requestObj];
    
    
    -(NSString *)readCurrentCookie{
        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];
        }
        return cookieValue;
    }
    
    

    获取Cookie
    由于 WKWebView 的 Cookie 存储容器 WKWebsiteDataStore 是私有存储,所以无法从这里获取到Cookie,目前的方法是(1)从网站返回的 response headerfields 中获取。(2)通过调用js的方法获取 cookie。

    • 1.从网站返回的 response headerfields 中获取,因为cookie都存在http respone的headerfields,找到能获得respone的WKWebView回调,打印
    - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{
        NSHTTPURLResponse *response = (NSHTTPURLResponse *)navigationResponse.response;
        NSArray *cookies =[NSHTTPCookie cookiesWithResponseHeaderFields:[response allHeaderFields] forURL:response.URL];
        //读取wkwebview中的cookie 方法1
        for (NSHTTPCookie *cookie in cookies) {
    //        [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
            NSLog(@"wkwebview中的cookie:%@", cookie);
     
        }
        //读取wkwebview中的cookie 方法2 读取Set-Cookie字段
        NSString *cookieString = [[response allHeaderFields] valueForKey:@"Set-Cookie"];
        NSLog(@"wkwebview中的cookie:%@", cookieString);
     
        //看看存入到了NSHTTPCookieStorage了没有
        NSHTTPCookieStorage *cookieJar2 = [NSHTTPCookieStorage sharedHTTPCookieStorage];
        for (NSHTTPCookie *cookie in cookieJar2.cookies) {
            NSLog(@"NSHTTPCookieStorage中的cookie%@", cookie);
        }
    //下面是将 原始cookie本地 化
    NSMutableArray *cookieArray = [[NSMutableArray alloc] init];
        for (NSHTTPCookie *cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) {
    
            NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];
            [cookieProperties setObject:cookie.name forKey:NSHTTPCookieName];
            [cookieProperties setObject:cookie.value forKey:NSHTTPCookieValue];
            [cookieProperties setObject:cookie.domain forKey:NSHTTPCookieDomain];
            [cookieProperties setObject:cookie.path forKey:NSHTTPCookiePath];
            [cookieProperties setObject:[NSNumber numberWithInt:cookie.version] forKey:NSHTTPCookieVersion];
            [cookieProperties setObject:[[NSDate date] dateByAddingTimeInterval:2629743] forKey:NSHTTPCookieExpires];
          [cookieArray addObject:cookieProperties];
        }
        
        [[NSUserDefaults standardUserDefaults] setValue:cookieArray forKey:@"cookieArray"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    
        decisionHandler(WKNavigationResponsePolicyAllow);
    }
    
    // 页面加载完成之后调用需要重新给WKWebView设置Cookie防止因为a标签跳转,导致下一次跳转的时候Cookie丢失。
    - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
        //取出cookie
        NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
        //js函数
        NSString *JSFuncString =
        @"function setCookie(name,value,expires)\
        {\
        var oDate=new Date();\
        oDate.setDate(oDate.getDate()+expires);\
        document.cookie=name+'='+value+';expires='+oDate+';path=/'\
        }\
        function getCookie(name)\
        {\
        var arr = document.cookie.match(new RegExp('(^| )'+name+'=({FNXX==XXFN}*)(;|$)'));\
        if(arr != null) return unescape(arr[2]); return null;\
        }\
        function delCookie(name)\
        {\
        var exp = new Date();\
        exp.setTime(exp.getTime() - 1);\
        var cval=getCookie(name);\
        if(cval!=null) document.cookie= name + '='+cval+';expires='+exp.toGMTString();\
        }";
    
        //拼凑js字符串
        NSMutableString *JSCookieString = JSFuncString.mutableCopy;
        for (NSHTTPCookie *cookie in cookieStorage.cookies) {
            NSString *excuteJSString = [NSString stringWithFormat:@"setCookie('%@', '%@', 1);", cookie.name, cookie.value];
            [JSCookieString appendString:excuteJSString];
        }
        //执行js
        [webView evaluateJavaScript:JSCookieString completionHandler:^(id obj, NSError * _Nullable error) {
            NSLog(@"%@",error);
        }];
    }
    
    
    • 通过 JS 获取 cookie
    - (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation
    {
        
        [webView evaluateJavaScript:[NSString stringWithFormat:@"document.cookie"] completionHandler:^(id _Nullable response, NSError * _Nullable error) {
            if (response != 0) {
                NSLog(@"\n\n\n\n\n\n document.cookie%@,%@",response,error);
            }
        }];
    }
    

    注意

    document.cookie 的方法获取 cookie并不支持跨越获取,如果设置 httponly则获取不到 cookie
    不论是(1)还是(2)方法,似乎都无法解决302请求的 Cookie 问题。举例来说,假设你要访问网站A,在A中点击登录,跳转页面到B地址,在B中完成登录之后302跳转回A网站。此时cookie是存在于B地址的 response 中的,在A地址的 response 中并没有 cookie 的字段。然而我们只能获取到A地址的 response ,无法截获到B地址的response。因此获取不到该类型网站的 cookie 。
    由于我并没有遇到302这样的问题,所有看了下网上的资料,希望对遇到这个问题的小伙伴一下办法,网上给出的解决办法是:

    • 1.加载一个本地为空的html,域名指向你的第一次加载的url的域名。
    //加载本地html
    [self.webView loadHTMLString:@"" baseURL:[NSURL URLWithString:@"https:/a.com"]];
    
    • 2.通过以下方法,在第一次加载完成后,将需要设置的Cookies设置到WKWebView中,因为是加载的本地的html以下方法会立即执行。
    // 页面加载完成之后调用
    - (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
        
        if (isFirstLoaded) {
            NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
            //js函数
            NSString *JSFuncString =
            @"function setCookie(name,value,expires)\
            {\
            var oDate=new Date();\
            oDate.setDate(oDate.getDate()+expires);\
            document.cookie=name+'='+value+';expires='+oDate+';path=/'\
            }";
            
            //拼凑js字符串,按照自己的需求拼凑Cookie
            NSMutableString *JSCookieString = JSFuncString.mutableCopy;
            for (NSHTTPCookie *cookie in cookieStorage.cookies) {
                if (![cookie.name isEqualToString:@"__cust"]) {
                    NSString *excuteJSString = [NSString stringWithFormat:@"setCookie('%@', '%@', 3);", cookie.name, cookie.value];
                    [JSCookieString appendString:excuteJSString];
                }
            }
            
            //执行js
            [webView evaluateJavaScript:JSCookieString completionHandler:^(id obj, NSError * _Nullable error) {
                //加载真正的第一次Request
                [self loadRealRequest];
            }];
        }
    }
    
    

    如果cookie 存储到本地获取本地的 cookie

    //修改从 storage 中读取 cookie 的方法
    -(NSString *)readCurrentCookie{
        
        NSMutableArray* cookieDictionary = [[NSUserDefaults standardUserDefaults] valueForKey:@"cookieArray"];
        NSLog(@"cookie dictionary found is %@",cookieDictionary);
        
        for (int i=0; i < cookieDictionary.count; i++) {
            NSLog(@"cookie found is %@",[cookieDictionary objectAtIndex:i]);
            NSMutableDictionary* cookieDictionary1 = [[NSUserDefaults standardUserDefaults] valueForKey:[cookieDictionary objectAtIndex:i]];
            NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:cookieDictionary1];
            [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie: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];
        }
        return cookieValue;
    }
    
    

    清除 cookie

    #pragma mark - 清空cookie
    -(void)deleCookie {
    //    NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    //    NSArray *_tmpArray = [NSArray arrayWithArray:[cookieJar cookies]];
    //    for (id obj in _tmpArray) {
    //        [cookieJar deleteCookie:obj];
    //    }
        if (@available(iOS 9.0, *)) {//iOS9及以上
            WKWebsiteDataStore *dateStore = [WKWebsiteDataStore defaultDataStore];
            [dateStore fetchDataRecordsOfTypes:[WKWebsiteDataStore allWebsiteDataTypes]
                             completionHandler:^(NSArray<WKWebsiteDataRecord *> * __nonnull records) {
                                 for (WKWebsiteDataRecord *record in records)
                                 {
                                     //if ( [record.displayName containsString:@"baidu"]) //取消备注,可以针对某域名做专门的清除,否则是全部清除
                                     //               {
                                     [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:record.dataTypes
                                                                               forDataRecords:@[record]
                                                                            completionHandler:^{
                                                                                NSLog(@"Cookies for %@ deleted successfully",record.displayName);
                                                                            }];
                                     //               }
                                 }
                             }];
        }else { //iOS9以下
            NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
            NSString *cookiesFolderPath = [libraryPath stringByAppendingString:@"/Cookies"];
            NSError *errors;
            [[NSFileManager defaultManager] removeItemAtPath:cookiesFolderPath error:&errors];
        }
    }
    
    

    最后

    UIWebView 和 WKWebView 所遇到问题 cookie 同步,获取,删除,设置这些问题,目前就这么多解决办法吧,我一开始尝试用 WKWebView 获取 cookie 但是最后遇到网页跨域问题以及低版本兼容问题我还是换回 UIWebView 了,如果有更好的解决办法可以在下面留言,谢谢!
    参考(https://www.jianshu.com/p/4ae4fd25a4b8

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