I’m taking a look at this widget, and it appears to be a UIPickerView, however I haven’t seen anything provided by the iPhone SDK API that allows for horizontal scrolling only. Mostly it’s all done vertically. Also there appears to be a custom graphic around this picker, so it might not be that either.
I’m curious if anyone is able to determine if this is indeed a UIPickerView or perhaps a hacked up UIScrollView? The widget is handy — and I like its use. I found it in some random groceries app in the app store.
Here is the screenshot:

Thanks all.
That is totally custom. You could indeed do something of the sort overlaying an UIImageView and an UIScrollView. I’d guess it’s a 100% custom. As with all programming, there are many ways to do any single thing.