The Core OS layer defines programming interfaces that are related to hardware and networking, including interfaces for running high-performance computation tasks on a computer’s CPU and GPU. The Core Services layer contains many fundamental services and technologies that range from Automatic Reference Counting and low-level network communication to string manipulation and data formatting. The Media layer encompasses specialized technologies for playing, recording, and editing audiovisual media and for rendering and animating 2D and 3D graphics. The Cocoa (Application) layer includes technologies for building an app’s user interface, for responding to user events, and for managing app behavior. Here is a brief summary of the layers of OS X.
A good rule of thumb is to use the highest-level programming interface that meets the goals of your app. Generally, technologies in higher layers incorporate lower-level technologies to provide common app behaviors. The lower the layer a technology is in, the more specialized are the services it provides. Subsequent layers contain more sophisticated services and technologies that build on (or complement) the layers below.
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The lower layers of the system provide the fundamental services on which all software relies. It’s helpful to view the implementation of OS X as a set of layers. OS X Has a Layered Architecture with Key Technologies in Each Layer It does not describe user-level system features or features that have no impact on software development.
This guide introduces you to the range of possibilities for developing Mac software, describes the many technologies you can use for software development, and points you to sources of information about those technologies.
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Knowing what these technologies are, and how to use them, can help streamline your development process, while giving you access to key OS X features. The OS X operating system combines a stable core with advanced technologies to help you deliver world-class products on the Mac platform.
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