# ReactiveCocoa

Cocoa framework and Obj-C dynamism bindings for ReactiveSwift.

Repository: https://github.com/ReactiveCocoa/ReactiveCocoa
Canonical: https://ross.abutalabs.com/products/reactivecocoa
Language: Swift
License: MIT
License Family: permissive
Topics: reactiveswift, reactivecocoa, swift
Last push: 2025-09-12T03:55:10+00:00

## Health v2 (maintenance only)
Score: 41/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 41, release rhythm 8, longevity 100
- inputs: {"age_days": 5297, "days_push": 355, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 19815, forks 3411 (observed 2026-08-28T04:11:29.282654+00:00)

## What it is
ReactiveCocoa provides reactive extensions to Apple's Cocoa frameworks, built on top of ReactiveSwift's composable streams-of-values-over-time primitives. It offers declarative UI bindings, control event signals, and Objective-C dynamism interception for iOS, macOS, watchOS, and tvOS apps.

## Use cases
- bind view model properties to UI controls in Swift
- handle button taps and control events as signal streams
- reactively update UI from streams of values over time
- replace delegate and notification patterns with declarative signals
- observe text field changes and compute derived values
- migrate an Objective-C ReactiveCocoa codebase to Swift

## When to choose
- you're building an iOS or macOS app with a reactive, declarative architecture
- you want composable signal primitives for UI bindings and user interactions
- you prefer streams-over-time semantics over Combine or async/await patterns
- you need Objective-C method interception and deinit signals in Swift

## When to avoid
- you're starting a new project and prefer Apple's native Combine or Swift Concurrency
- your app targets platforms outside Apple's ecosystem
- you want a minimal dependency footprint for simple UI code
- your team has no experience with functional reactive programming

## Facets
- artifact type: framework
- maturity: active
- function: state-management, ui-components, middleware
- domain: mobile-development, frontend
- platform: -
- tags: reactive-programming, cocoa, functional-reactive-programming, signals, bindings, swift, ios, macos, mobile

## Member repositories
- ReactiveCocoa/ReactiveCocoa (main) score 41
- ReactiveCocoa/ReactiveSwift (backend) score 36
- ReactiveCocoa/ReactiveObjC (mirror) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:29.282654+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T16:59:26.022863+00:00, confidence not recorded.
  - readme: https://github.com/ReactiveCocoa/ReactiveCocoa (fetched 2026-08-28T04:11:29.282654+00:00, sha d35601facc39)
- Data as of 2026-08-30T08:39:29.467469+00:00.