I found GIKPopoverBackgroundView and the demo app for it looked good.
It was fairly easy to use –
- Copy GIKPopoverBackgroundView.h/.m into my project
- Copy the images from the images folder into my project
- Import the GIKPopoverBackgroundView.h into the class I want to use it in.
- Set the background view class on my UIPopoverController (below)
myPOController.popoverBackgroundViewClass = [GIKPopoverBackgroundView class];