How to refresh the list data when I disconnect internet

[denglei022]

Describe the bug
Can you handle when I disconnect internet and try refresh the list data ? I can handle the error in the Networking.swift, but how can I let my refresh trigger not competed with error. I can't refresh the tableview again By using headerRefreshTrigger or footerRefreshTrigger ， because the subject is competed if receive the error.

To Reproduce
Steps to reproduce the behavior:

Go to one TablView Controller
disconnect the wifi
refresh the data again
loading forever
didn't send the subject signal and can't send request again ,so the tableview is loading forever