把这几行代码进来就行了，具体效果能不能达到需求你也不知道，没法测。


[[NSURLCache sharedURLCache] removeAllCachedResponses];

for (NSHTTPCookie *cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) {

[[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];

}


有博文也是这么写的http://blog.csdn.net/zhaoweixing1989/article/details/13021571