Google Cloud Print iOS SDK by Conrad Kramer. It can integrates Google Cloud Print into Apple's AirPrint feature. This work uses AFIncrementalStore, AFOAuth2Client, and AFNetworking to communicate with the Cloud Print API, as mentioned by the author. Additional resources include prerequisites, how to build, and how to install.
As phones get smarter and tablets become more ubiquitous, people need to access their content from more and more places. When files must constantly be transferred between multiple devices, however, the hassle of that process can easily outweigh the utility of being able to access your content anywhere. One solution is cloud storage - by having content stored online, there is no need to transfer files or make sure they are up to date. For cloud storage to be a truly effective solution, however, it must be integrated into all of the applications in which a user would want to access his content, which requires easy-to-implement, well documented APIs.