Flutter pull-up loads and pull-down refreshes real network requests

Refresh the library

• Thanks to the author of Flutter_easyRefresh, git address: github.com/xuelongqy/f…
• Personal project Address :github.com/wlong8000/f…

Go straight to code

• The ViewModel class, which handles network requests and data processing, separates network requests from data presentation

  

• Register a listener in initState. Once the data is sent, it will be notified to this place. Call setState and refresh the interface

• The build only needs to show the data, not deal with the data logic