登录成功后

NSUserDefaults * defaults =[NSUserDefaults standardUserDefaults];
NSArray * allCookies =[[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
for (NSHTTPCookie * cookie in allCookies) {
    if ([cookie.name isEqualToString:@"PHPSESSID"]) {
        NSMutableDictionary *cookieDictonary =[NSMutableDictionary dictionaryWithDictionary:[defaults dictionaryForKey:@"MyProjectCookie"]];
        [cookieDictonary setValue:cookie.properties forKey:@"cookieDict"];
        [defaults setObject:cookieDictonary forKey:@"MyProjectCookie"];
        [defaults synchronize];
        break;
    }
}

AF框架中

//设置请求头
  if (![requestURLString containsString:BP_LOGIN]||![requestURLString containsString:BP_REGISTERED]) {
    NSLog(@"不是登录接口%@",[[[NSUserDefaults standardUserDefaults] objectForKey:@"MyProjectCookie"] valueForKey:@"cookieDict"]);
    if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"MyProjectCookie"] valueForKey:@"cookieDict"]!=nil&&[GLUserModel shareInstance].loginY) {
        NSHTTPCookie *cookie =[NSHTTPCookie cookieWithProperties:[[[NSUserDefaults standardUserDefaults] objectForKey:@"MyProjectCookie"] valueForKey:@"cookieDict"]];
        [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
    }
    
  }

手动创建cookie

    // 创建cookie属性字典
    NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];  
   [cookieProperties setObject:@"username"  forKey:NSHTTPCookieName]; // 手动设置cookie的属性
   [cookieProperties setObject:@"rainbird" forKey:NSHTTPCookieValue];
   [cookieProperties setObject:@"cnrainbird.com" forKey:NSHTTPCookieDomain];
   [cookieProperties setObject:@"cnrainbird.com" forKey:NSHTTPCookieOriginURL];
   [cookieProperties setObject:@"/" forKey:NSHTTPCookiePath];
   [cookieProperties setObject:@"0" forKey:NSHTTPCookieVersion];
   // 通过NSHTTPCookie的cookieWithProperties方法,将属性字典传入进行初始化,对象返回的是一个NSHTTPCookie对象,创建完成后进行下一步操作：
   NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:cookieProperties];
 // 将手动创建返回的NSHTTPCookie对象添加到NSHTTPCookieStorage中,在iOS中使用[NSHTTPCookie]  
   [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];        

(http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSHTTPCookie_Class/Reference/Reference.html)类封装一条cookie,通过NSHTTPCookie的方法读取到cookie的通用属性。在此声明一点:如果你的request里面明确不使用cookie,那么要讲cookie的([HTTPShouldHandleCookies]

(http://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSURLRequest_Class/Reference/Reference.html#//apple_ref/occ/instm/NSURLRequest/HTTPShouldHandleCookies)设为NO),否则URL loading system会自动为NSURLRequest发送合适的存储cookie。
//文章来源http://jinqianchina.github.io/2016/01/07/Cookie%E6%9C%BA%E5%88%B6%E4%BB%A5%E5%8F%8Acookie%E5%9C%A8iOS%E4%B8%AD%E4%BD%BF%E7%94%A8%E4%BB%8B%E7%BB%8D/
http://www.jianshu.com/p/65094611980c