iOS UIWebView 和 WKWebView 的 cookie 获取,设置,删除

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。若是项目中，全部页面都是纯原生来实现的话，通常Cookie这个东西或许咱们永远也不会接触到。可是，这里仍是要说一下Cookie，由于它真的很重要，由它产生的一些坑也不少。html

Cookie 在 web中应用比较多,主要是记录一个状态,好比我在网页上登陆了,我就能够拿到网页登陆后 Cookie,下次再 Cookie 的生效期内我就能够不用输入帐号密码,直接跳转登陆状态,在App中,Cookie最经常使用的也就是维持登陆状态了.由于笔者最近就在作这个,其中也遇到过不少坑,这里说先踩坑和用法ios

iOS Cookie 的管理web

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。设计模式

NSHTTPCookieStorage跨域

NSHTTPCookieStorage类采用单例的设计模式，其中管理着全部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 单例表明一个 cookie。一般来说，cookie 能够在应用间共享，而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）是局部的而且不能被共享。数组

经常使用方法缓存

// 获取单例对象
+ (NSHTTPCookieStorage *)sharedHTTPCookieStorage;

// 全部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;

// 删除某个时间后的全部Cookie信息 iOS8后可用
- (void)removeCookiesSinceDate:(NSDate *)date NS_AVAILABLE(10_10, 8_0);

// 获取某个特定URL的全部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
枚举以下：
typedef NS_ENUM(NSUInteger, NSHTTPCookieAcceptPolicy) {
    NSHTTPCookieAcceptPolicyAlways,                     //接收全部Cookie信息
    NSHTTPCookieAcceptPolicyNever,                      //不接收全部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：
听说,在Mac OS是cookie能够共享的(Session cookies 不能共享),在Mac OS app中更改cookie的接收策略会影响到其余正在运行的在使用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介绍安全

NSHTTPCookie是具体的HTTP请求Cookie数据对象.cookie

// 下面两个方法用于对象的建立和初始化 都是经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;

// 过时时间
@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;

// 是不是安全传输
@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 | 解读网络

NSHTTPCookieName        |	Cookie的名字
NSHTTPCookieValue       |	Cookie的值
NSHTTPCookieOriginURL   |	和域名同样,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是否只应经过安全通道发送，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，在这种状况下，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。而且在同一个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]) {
                //若是 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 去重是为了获得 key=Value;形式的字符串，这里因为我有需求这样作，实际中下面能够忽略
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];
    }
}
//设置请求以前加载 cookie 确保 cookie 在请求头以前设置
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没法操做(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，由于 NSURLSession/NSURLConnection等网络请求使用NSHTTPCookieStorage进行访问Cookie,因此不能访问WKWebView的Cookie,现象就是WKWebView存了Cookie,其余的网络类如NSURLSession/NSURLConnection却看不到。这是不少人的说法。还有一种是说法是经过实践发现 WKWebView 实例其实也会将 Cookie 存储于 NSHTTPCookieStorage 中，但存储时机有延迟，由于WKWebView内也有cookie的容器，并且每隔一段时间就和app侧NSHTTPCookieStorage进行同步，并且这个同步是进程级别的同步，并且这个同步是单向。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 能够解决该问题，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。因而会发生首次 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。示例代码以下：

[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 以前 注入 Cookie 就是从以前保存 cookie 的 NSHTTPCookieStorage 中取出相关 Cookie,而后在再次请求访问的时候在 request 中注入 Cookie。注入Cookie一样有多种方式。
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

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

1.从网站返回的 response headerfields 中获取,由于cookie都存在http respone的headerfields,找到能得到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);
}

// 页面加载完成以后调用须要从新给WKWebView设置Cookie防止由于a标签跳转，致使下一次跳转的时候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);
    }];
}

经过 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，若是设置 httponly则获取不到 cookie 不管是（1）仍是（2）方法，彷佛都没法解决302请求的 Cookie 问题。举例来讲，假设你要访问网站A，在A中点击登陆，跳转页面到B地址，在B中完成登陆以后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 中并无 cookie 的字段。然而咱们只能获取到A地址的 response ，没法截获到B地址的response。所以获取不到该类型网站的 cookie 。因为我并无遇到302这样的问题，全部看了下网上的资料，但愿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.经过如下方法，在第一次加载完成后，将须要设置的Cookies设置到WKWebView中，由于是加载的本地的html如下方法会当即执行。

// 页面加载完成以后调用
- (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，按照本身的需求拼凑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];
        }];
    }
}

若是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)
            {
                //取消备注，能够针对某域名作专门的清除，不然是所有清除
                //if ( [record.displayName containsString:@"baidu"])             
                //{
                    [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:record.dataTypes
                    forDataRecords:@[record] completionHandler:^
                    {
                        NSLog(@"Cookies for %@ deleted successfully",record.displayName);
                    }];
                //}
            }
        }];
    }
    else { //iOS9如下
        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 可是最后遇到网页跨域问题以及低版本兼容问题我仍是换回 UIWebView 了，若是有更好的解决办法能够在下面留言，谢谢！

来自：http://www.javashuo.com/article/p-qwazqard-q.html

原文出处：https://www.cnblogs.com/benxiaokang/p/ios-uiwebview-he-wkwebview-de-cookie-huo-qu-she-zh.html