During the development of our latest app Back in Touch, some of the challenges we faced inspired us to create a new iOS control called RMEIdeasPullToSort control. This control allows users to perform different custom actions when a UIScrollView is dragged to have a negative content offset. Although this control would work with any UIScrollView, it naturally lends itself to sort operations in UITableViews - hence the name RMEIdeasPullToSort control.
Back in Touch enables users keep in touch with contacts who might be lost or forgotten in their ever growing phone book. We have also made this library open source under MIT License.
Back in Touch - itunes.apple.com/app/back-in-touch/id611668753
GitHub link -