Apple will introduce new versions of iOS and OS X at its annual developer's conference.
Apple Disallows Previously Approved Calculator Widgets for iOS 8 Notification Center
Apple's sudden decision to disallow PCalc's previously approved widget is somewhat surprising as the app is featured in multiple places in the App Store, including a section called "Extend Your Apps" featuring apps with unique widgets, and "Great Apps and Games for iOS 8," which also features a selection of Notification Center widgets.
Apple has told me that Notification Center widgets on iOS cannot perform any calculations, and the current PCalc widget must be removed.— James Thomson (@jamesthomson) October 29, 2014
Apple appears to have some fairly strict guidelines governing the proper usage of Notification Center widgets. PCalc is not the first app that's facing the removal of its widget, as Apple previously pulled Launcher from the App Store. Launcher installed a Notification Center widget that provided access to quick actions like making a phone call, opening a pre-defined Maps route, or sending a tweet.
Apple's App Extension guidelines do clearly state that Notification Center widgets should have a "simple, streamlined UI," a limited number of interactive items, and specifies that a widget is "not a mini version" of an app, but it does not appear to expressly disallow calculations. There's also a Pcalc app for OS X Yosemite that brings similar functionality to the desktop Notification Center and it is unclear whether Apple will also require the removal of that widget.
For the time being, PCalc can be downloaded from the App Store for $9.99, with access to the Notification Center widget included. [Direct Link]