iOS: Scroll up to refresh

Many 开发者_如何学GoiOS apps have a "scroll up to refresh" feature, such as the Twitter app. If you scroll up beyond the beginning of the page or table, you'll get a message explaining how to use the feature.

That controller is not from Apple but many apps seem to use it. I was told it was released for public use by a programmer, but I can't find it after a long google session.

I'd be grateful if anyone can direct me to it! Thanks!

This is a popular implementation: https://github.com/enormego/EGOTableViewPullRefresh

Here's a link to the original code by enormego on github:

https://github.com/enormego/EGOTableViewPullRefresh

https://github.com/enormego/EGOTableViewPullRefresh

Also it was in Facebook's three20 library I guess.

I was able to find two examples a few minutes after posting this question:

How to make a Pull-To-Reload TableView just like Tweetie 2