本来以为自定义cookie能够把一个域中的cookies,带给另外一个域来使用.实际中没有考虑到服务器也是根据域进行逻辑限定的,最终无法使用的.

下面的代码当作证明过程中的一个关键部分实现吧.

    NSArray *tmp_Cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:[NSURL URLWithString:@"https://www.thirtydevs.com"]];
     NSLog(@"1:%@",[[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]);
    for (NSHTTPCookie *cookie in tmp_Cookies)
    {
        //从cookies中获取sessionid并保存.
        if ([[cookie domain] isEqualToString:@"www.thirtydevs.com"]) {
            NSDictionary *cookieProperties = [[NSMutableDictionary alloc]init];
            
            [cookieProperties setValue:[cookie value] forKey:NSHTTPCookieValue];
            [cookieProperties setValue:[cookie name]  forKey:NSHTTPCookieName];
            [cookieProperties setValue:@"m.thirtydevs.com" forKey:NSHTTPCookieDomain];
            //没有增加新cookie也许是由于没有把NSHTTPCookieExpires和NSHTTPCookiePath设置好.
            [cookieProperties setValue:nil forKey:NSHTTPCookieExpires];
            [cookieProperties setValue:[cookie path] forKey:NSHTTPCookiePath];
            
            NSHTTPCookie *ncookie = [[NSHTTPCookie alloc] initWithProperties:cookieProperties];
            [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:ncookie];
            [ncookie release];
            break;
        }
    }
    NSLog(@"2:%@",[[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]);