Technologies›Area 14

Foundation, System & Concurrency

29 frameworks

This area provides the base layer of every Apple app: the core value types, collections, strings, dates, files, URLs, and networking that higher-level frameworks build on, together with the language and system primitives beneath them. Its frameworks define how work executes concurrently through actors, async/await, queues, and atomics, and how programs interact with the operating system via low-level system calls, logging, compression, and inter-process communication. Together they establish the data model, execution model, and system-services foundation shared across all platforms.

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Foundation464 types

Core data types, collections, strings, dates, files, URLs, networking, and OS services forming the base layer of Apple apps.

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The Swift standard library: core types, collections, protocols, generics, and language primitives underpinning all Swift code.

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_Concurrency overlay44 types

Swift standard library concurrency model: actors, tasks, executors, async/await and structured concurrency primitives.

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Dispatch39 types

Grand Central Dispatch concurrency primitives: queues, groups, semaphores, sources, and timers for managing work execution.

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Accelerate216 types

High-performance vectorized math, image (vImage), DSP, linear algebra and BNNS neural-net primitives for large-scale computation.

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BackgroundAssets15 types

Lets an app extension schedule and manage downloads of large assets in the background, before or after the app launches.

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BackgroundTasks11 types

Schedule and run deferrable maintenance and refresh tasks while the app is in the background via BGTaskScheduler.

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Combine32 types

Declarative reactive framework for processing values over time via publishers, subscribers, and operators with cancellation.

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Compression10 types

Compression algorithms (LZFSE, LZ4, ZLIB, LZMA) wrapping the C compression API for compressing and decompressing data.

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CoreFoundation132 types

Low-level C foundation framework providing core data types, collections, strings, bundles, run loops and OS abstractions.

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CoreServices62 types

Core system services including Uniform Type Identifiers (UTType) and core type definitions.

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CoreTransferable11 types

Defines the Transferable protocol so types can declare how they are encoded/decoded for drag-and-drop, copy-paste and sharing.

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Distributed16 types

Swift standard library support for distributed actors that communicate across process or network boundaries via pluggable actor systems.

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EventKit36 types

Creates, accesses, and edits calendar events and reminders in the Calendar and Reminders databases, with change notifications.

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MobileCoreServices

Legacy iOS Uniform Type Identifier (UTType) definitions, now re-exported from CoreServices.

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Observation4 types

The @Observable macro and registrar that emit change notifications to observers when an object's tracked properties change.

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Low-level OS facilities including unified logging (os_log), signposts, locks, and activity tracing.

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RegexBuilder16 types

A result-builder DSL for composing Swift regular expressions declaratively from character classes, alternations, and captures.

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ServiceManagement

Register and manage launch/login items, daemons, and agents, plus per-app service configuration via SMAppService.

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Provides SIMD vector and matrix types with vectorized math, geometry and linear-algebra operations for high-performance computation.

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Synchronization9 types

Low-level concurrency primitives such as Atomic values with explicit memory orderings for safe lock-free synchronization.

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A namespace for C and platform types and low-level system call wrappers (errno, file descriptors, paths).

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UniformTypeIdentifiers3 types

Declares and queries Uniform Type Identifiers (UTType) describing file and data content types and their conformance hierarchy.

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WeatherKit49 types

Fetches current, hourly, daily, and historical weather forecasts and statistics for a location via WeatherService.

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Swift wrappers over libxpc for inter-process communication using XPC objects, connections, arrays and dictionaries.

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_Builtin_float overlay

Swift overlay exposing C float.h floating-point limit constants (DBL_MAX, FLT_EPSILON, etc.).

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_DarwinFoundation2 overlay

Internal Darwin C library overlays for stdio, string, ctype, time, byte order, and other POSIX functions.

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_StringProcessing overlay7 types

Regex engine support providing type-erased AnyRegexOutput and dynamic regular-expression match output.

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_System_Foundation overlay

Foundation interoperability layer for the low-level System module's file paths, errno, and POSIX-style system primitives.

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