The Watch Connectivity framework (WatchConnectivity.framework) provides a two-way communications conduit between an iOS app and a WatchKit extension on a paired Apple Watch. Apps use this framework to pass files and data back and forth. Most transfers happen in the background when the receiving app is inactive. When the app wakes up, it is notified of any data that arrived while it was inactive. Live communication is also possible when both apps are active.

Appsee SDK for UIKit applications

Work with image and video assets managed by the Photos app, including those from iCloud Photo Library and Live Photos. Fetch and cache full-sized assets or thumbnails asynchronously, revise content, and sync revisions to multiple devices. In iOS and macOS, the Photos framework provides classes that support building photo editing extensions for the Photos app. In iOS and tvOS, the Photos framework also provides direct access to the photo and video assets managed by the Photos app, including the iCloud Photo Library. Use this framework to retrieve assets for display and playback, edit their image or video content, or work with collections of assets such as albums, moments, and iCloud Shared Albums.

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Render advanced 3D graphics and perform data-parallel computations. Get fine-grained access to the GPU while minimizing CPU overhead. The Metal Framework provides extremely low-overhead access to the GPU, enabling incredibly high performance for your sophisticated graphics rendering and computational tasks. Metal eliminates many performance bottlenecks—such as costly state validation—that are found in traditional graphics APIs. Metal moves all expensive state translation and compilation operations out of the critical path of your most performance sensitive rendering code. It provides precompiled shaders, state objects, and explicit command scheduling to ensure that your application achieves the highest possible performance and efficiency. Graphics, compute, and blit commands can be used together seamlessly and efficiently. Metal is specifically designed to exploit modern architectural considerations, such as multiprocessing and shared memory, to make it easy to parallelize the creation of GPU commands.

The Address Book framework provides access to a centralized contacts database, called the Address Book database, that stores a user’s contacts. Applications such as Mail and Messages use this database to present information about known and unknown persons.

The Ad Support framework provides apps with access to an identifier that can be used only for serving advertisements, as well as a flag which indicates whether a user has limited ad tracking. Accessing the advertising identifier requires apps to read and honor the opt-out flag.