iOS获取cookies保持会话

//获取cookie
NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage]cookiesForURL:[NSURL URLWithString:url]];
for (NSHTTPCookie *tempCookie in cookies)
        {
            //打印cookies
            NSLog(@"getCookie:%@",tempCookie);
        }
NSDictionary *Request = [NSHTTPCookie requestHeaderFieldsWithCookies:cookies];

NSUserDefaults *userCookies = [NSUserDefaults standardUserDefaults];
[userCookies setObject:[Request objectForKey:@"Cookie"] forKey:@"mUserDefaultsCookie"];
[userCookies synchronize];

再在你须要的页面中调用出你的cookie，并存放在请求头中便可

[session.requestSerializer setValue:[[NSUserDefaults standardUserDefaults]objectForKey:@"mUserDefaultsCookie"]forHTTPHeaderField:@"Cookie"];