ios11 - WKHTTPCookieStore 未检索设置的 Cookie。

Question

我正在尝试以编程方式设置 cookie，但它不起作用。cookie 给人的印象是它是有效的。然后我把它设置在WKWebsiteDataStore.default().httpCookieStore. 在异步回调中，我尝试将所有 cookie 从存储中取出。但是，我的 cookie 不存在。去哪儿了！？

    let httpCookieStore = WKWebsiteDataStore.default().httpCookieStore

    var cookieProperties = [HTTPCookiePropertyKey: Any]()
    cookieProperties[.name] = "MarkCookie"
    cookieProperties[.value] = "MarkValue"
    cookieProperties[.domain] = "localhost"
    cookieProperties[.maximumAge] = 1234
    cookieProperties[.path] = "/"

    let cookie = HTTPCookie(properties: cookieProperties)!

    httpCookieStore.setCookie(cookie) {
        // This is called fine. The cookie looks ok. 
        print("Cookie set \(cookie)")

        DispatchQueue.main.async {
            httpCookieStore.getAllCookies { cookies in
                // This is empty!!!!
                print(cookies)
            }
        }
    }