iOS 清理某一个cookies 或者全部 cookies

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 (int i = 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]];
清除所有缓存方法：  

[[NSURLCache sharedURLCache] removeAllCachedResponses];