关于Cookie 在项目中的应用

项目用到了 把用户信息保存在 cookie 中，类似浏览器记录用户信息一样，然后请求的接口从cookie中获取 当前用户信息，这就要求我们每次登陆后把 cookie 保存起来，还有退出程序 清空cookie的 问题，由于项目中用到了 AFN，所以导致了一些难以发现的问题。

首先，用户第一次 注册APP，请求注册接口 后台会把cookie 返回回来，我们需要把cookie保存起来，代码如下：

NSHTTPURLResponse *response = (NSHTTPURLResponse *)task.response;
NSString *cookieString = [response.allHeaderFields valueForKey:@"Set-Cookie"];
 if (cookieString) {


          NSArray *cookieStrings = [cookieString componentsSeparatedByString:@","];
                for(NSString* temp in cookieStrings)
                {
                    NSArray *tempArr = [temp componentsSeparatedByString:@";"];
                    [finalCookie appendString:[NSString stringWithFormat:@"%@",tempArr[0]]];
                }
             [[XSTUserDefault sharedXSTUserDefault]loadUserInfoFormSanbox];
                [XSTUserDefault sharedXSTUserDefault].cookie = finalCookie;
                [[XSTUserDefault sharedXSTUserDefault]saveUserInfoToSanbox];
              [[NSUserDefaults standardUserDefaults] setObject:cookieString forKey:@"UserCookies"];
              [[NSUserDefaults standardUserDefaults] synchronize];
}
// 单例 项目中共享
                NSHTTPCookieStorage *myCookie = [NSHTTPCookieStorage sharedHTTPCookieStorage];
               NSMutableDictionary *mutdict = [NSMutableDictionary dictionary];
                [mutdict setObject:@"SESSION" forKey:NSHTTPCookieName];
                [mutdict setObject:cookieString forKey:NSHTTPCookieValue];
                [mutdict setObject:@"api.xiaoshentu.com" forKey:NSHTTPCookieDomain];
                [mutdict setObject:@"api.xiaoshentu.com" forKey:NSHTTPCookieOriginURL];
                [mutdict setObject:@"/" forKey:NSHTTPCookiePath];
                [mutdict setObject:@"0" forKey:NSHTTPCookieVersion];
                NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:mutdict];
                [myCookie setCookie:cookie];
                NSData *cookiesData = [NSKeyedArchiver archivedDataWithRootObject: [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]];
                //存储归档后的cookie  由于网页中用的数据是后台从 cookie取得所以需要保存起来，每次启动APP 在加载下 cookie
                NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
                [userDefaults setObject: cookiesData forKey: @"myCookie"];

每次请求接口需要把 cookie传给后台，由于用到的是AFN 当cookie 为空时 需要传给空字符串给后台，不然换个用户登录后台不会返回当前用户cookie，代码如下

  [[XSTUserDefault sharedXSTUserDefault]loadUserInfoFormSanbox];
    NSString *cookieString = [XSTUserDefault sharedXSTUserDefault].cookie;
    NSLog(@"%@",cookieString);
    if(cookieString){
        [mgr.requestSerializer setValue: cookieString forHTTPHeaderField:@"Cookie"];
    }else{
        [mgr.requestSerializer setValue:@"" forHTTPHeaderField:@"Cookie"];
    }

由于APP 中加载网页需要用户信息，后台是从cookie取得，由于网页是默认加载cookie的 所以每次启动APP 需要加载下当前的 保存的cookie，代码如下：

//合适的时机加载持久化后Cookie 一般都是app刚刚启动的时候
- (void)loadSavedCookies{
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    
    //对取出的cookie进行反归档处理
    NSArray *cookies = [NSKeyedUnarchiver unarchiveObjectWithData:[userDefaults objectForKey:@"myCookie"]];
    
    if (cookies) {
        NSLog(@"有cookie");
        //设置cookie
        NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
        for (id cookie in cookies) {
            [cookieStorage setCookie:(NSHTTPCookie *)cookie];
        }
    }else{
        
        if ([[NSUserDefaults standardUserDefaults]objectForKey:@"UserCookies"]) {
            NSHTTPCookieStorage *myCookie = [NSHTTPCookieStorage sharedHTTPCookieStorage];
            NSMutableDictionary *mutdict = [NSMutableDictionary dictionary];
            [mutdict setObject:@"SESSION" forKey:NSHTTPCookieName];
            [mutdict setObject:[[NSUserDefaults standardUserDefaults]objectForKey:@"UserCookies"] forKey:NSHTTPCookieValue];
// 后面几个参数 一定要设置，否则发现 cookie 是空的
            [mutdict setObject:@"api.xiaoshentu.com" forKey:NSHTTPCookieDomain];
            [mutdict setObject:@"api.xiaoshentu.com" forKey:NSHTTPCookieOriginURL];
            [mutdict setObject:@"/" forKey:NSHTTPCookiePath];
            [mutdict setObject:@"0" forKey:NSHTTPCookieVersion];
            
            NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:mutdict];
            [myCookie setCookie:cookie];

        }
        
        
        
        NSLog(@"无cookie");
    }
    
    //打印cookie，检测是否成功设置了cookie
    NSArray *cookiesA = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
    for (NSHTTPCookie *cookie in cookiesA) {
        NSLog(@"setCookie: %@", cookie);
    }
}

加载网页请求是需要开启加载cookie,这样网页就能获取用户信息了。

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:self.url]];
    
    [request setHTTPShouldHandleCookies:YES];

    [self.h5WebView loadRequest:request];

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