ios – SFSafariViewController cookie

如果我使用以下内容在JS中的页面上设置cookie：

var dd = new Date(Date.Now() + 1000 * 60 * 60 * 24).toGMTString();
var expires = "expires="+ dd;
document.cookie = "mycookie=cookievalue; " + expires  + " domain=.mydomain.co.uk ; path=/ ";

如果我做 ：

- (void)safariViewController:(SFSafariViewController *)controller didCompleteInitialLoad:(BOOL)didLoadSuccessfully
{
  NShttpcookiestorage *storage = [NShttpcookiestorage sharedhttpcookiestorage];
  NSArray *cookiesArray = [storage cookies];
}

cookiesArray总是空的.

如果我使用传统的UIWebView

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
  NShttpcookiestorage *storage = [NShttpcookiestorage sharedhttpcookiestorage];
  NSArray *cookiesArray = [storage cookies];
}

我得到了我期待的cookie.

我有什么想法可能做错了吗？