清除所有的cookie 方法：
NSURL *url= [NSURL URLWithString:@"http://www.baidu.com"];
if (url) {
NSArray *cookies= [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:url];
for (inti=0; i<[cookies count]; i++) {
NSHTTPCookie *cookie= (NSHTTPCookie *)[cookies objectAtIndex:i];
[[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
}
清除某一个特定的cookie方法：
NSArray *cookArray= [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:[NSURL URLWithString:self.loadURL]]; NSString *successCode= @""; for (NSHTTPCookie*cookie in cookArray) { if ([cookie.name isEqualToString:@"cookiename"]) { [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie]; } }
清除某一个url缓存的方法
[[NSURLCache sharedURLCache] removeCachedResponseForRequest:[NSURLRequest requestWithURL:url]];
