ios开发如何清除所有网络请求的cookie

// 清除所有cookie

NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];

NSArray *_tmpArray = [NSArray arrayWithArray:[cookieJar cookies]];

for (id obj in _tmpArray) {

[cookieJar deleteCookie:obj];

}