“…Coverage includes Testing device properties so your app can take full advantage of the iOS unit it’s running on Seamlessly sharing documents and data across apps and moving control between apps Presenting exceptionally attractive text with freeform text typesetting Building touch-based apps that leverage Bezier curves, splines, and other geometric tools Securing network apps via authentication, system keychains, and OAuth Accessing and processing image data to create special effects Integrating live camera feeds and user snapshots Presenting audio to users and enabling them to interact with it Effectively using Address Book frameworks and GUI classes Building advanced location apps with Core Location geopositioning and MapKit Creating connected game play with GameKit/Game Center: device-to-device networking, shared leaderboards, and Internet-based matches Integrating secure in-app purchasing with StoreKit Communicating with users from web-based services via push notifications For related content by author Erica Sadun, see iOS Auto Layout Demystified , and The Core iOS 6 Cookbook …”