Inside App Extensions: the Cloud Kit-savvy Photos future of Apple's iPhoto & Aperture
At the same time, the fact that Extensions are always bundled in an app means that developers can deploy new Extensions as an app update (allowing Instagram to make its filters available in Photos, for example), and sell Extensions as an additional feature for their existing apps.

Even though everyone is articulating the idea that XPC is some new technology, it's really just a security-wise reworking of distributed objects. Which is great. Because DO is a terrific tool for Objective-C developers. The fact that it is coming to iOS is awesome. It signals the end of the era of monolithic iOS apps and the beginning of something entirely new.

Labels: app extensions, distributed objects, XPC service