Implementing pull to refresh view feature

Can we implement pull to refresh feature on a custom view controller?. My view controller is not a table view controller and I want t开发者_开发知识库o refresh this view on pulling the screen down. How can I implement this feature?

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In short, you need to do the following:

1. Embed your view in a UIScrollView.
2. Set your controller as the delegate of the scroll view.
3. Add a "Pull To Refresh" subview to the scroll view such that its frame is off the top of the screen. Something like CGRectMake(0, -30, 320, 30) for a 30pt-tall indicator view.
4. Implement –scrollViewDidScroll: to update your "Pull to Refresh" view as the user is dragging.
5. Implement –scrollViewDidEndDragging:willDecelerate: to check scrollView.contentOffset when the dragging ends. If it's beyond your threshold for refreshing, then do the refresh.