Ios 从 WKWebView 获取所有 cookie

虽然使用NSHTTPCookieStorage.sharedHTTPCookieStorage()从UIWebView获得cookies似乎很简单，但WKWebView似乎将cookies存储在其他地方.

我做了一些调查，我从NSHTTPURLResponse个物体上抓取了一些cookies .但是，这并不包含WKWebView使用的所有cookie:

func webView(webView: WKWebView, decidePolicyForNavigationResponse navigationResponse: WKNavigationResponse, decisionHandler: (WKNavigationResponsePolicy) -> Void) {

  if let httpResponse = navigationResponse.response as? NSHTTPURLResponse {
    if let headers = httpResponse.allHeaderFields as? [String: String], url = httpResponse.URL {
      let cookies = NSHTTPCookie.cookiesWithResponseHeaderFields(headers, forURL: url)

      for cookie in cookies {
        logDebug(cookie.description)

        logDebug("found cookie " + cookie.name + " " + cookie.value)
      }
    }
  }
}

奇怪的是，ios 9中还有一个类WKWebsiteDataStore负责管理WKWebView中的Cookie，但该类不包含检索Cookie数据的公共方法:

let storage = WKWebsiteDataStore.defaultDataStore()

storage.fetchDataRecordsOfTypes([WKWebsiteDataTypeCookies], completionHandler: { (records) -> Void in
  for record in records {
    logDebug("cookie record is " + record.debugDescription)

    for dataType in record.dataTypes {
      logDebug("data type is " + dataType.debugDescription)

      // get cookie data??
    }
  }
})

是否有用于获取Cookie数据的解决方法？