I love pull to refresh and I wanted to add it to iOS. Mark's video is awesome showing you how to use custom renderers, so I applied his practices to iOS:
http://motzcod.es/post/87917979362/pull-to-refresh-for-xamarin-forms-ios
UPDATE
See the new official way here: http://motzcod.es/post/113280718807/official-pull-to-refresh-in-xamarinforms-140
If you need scroll view please check out my new article and code base: http://motzcod.es/post/128274430137/pull-to-refresh-anyish-xamarinforms-view
the source is on github:
https://github.com/jamesmontemagno/Xamarin.Forms-PullToRefreshListView
here is a video:
