清除Cookie

NSHTTPCookieStorage *cookie = [NSHTTPCookieStorage sharedHTTPCookieStorage];
NSArray *tmpArray = [NSArray arrayWithArray: [cookie cookies]];
for (id obj in tmpArray) {
    [cookie deleteCookie: obj];
}
打印：
        NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (NSHTTPCookie *cookie in [cookieJar cookies]) {
        NSLog(@"%@", cookie);
    }