# blakewatters/TransitionKit

An Objective-C library for elegantly implementing state machines.

Repository: https://github.com/blakewatters/TransitionKit
Canonical: https://ross.abutalabs.com/products/transitionkit
Language: Objective-C
License: Apache-2.0
License Family: permissive
Last push: 2017-08-16T22:01:48+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4917, "days_push": 3304, "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 1321, forks 127 (observed 2026-08-28T04:04:21.915601+00:00)

## What it is
TransitionKit is a small Objective-C library providing a block-based API for implementing state machines on iOS and Mac OS X. It supports arbitrary states and events with transition callbacks, NSCopying/NSCoding compliance, and runtime validation of misconfigurations.

## Use cases
- implement a state machine in an iOS app
- model object lifecycle states like message read/unread
- manage complex state transitions in Objective-C code
- add transition callbacks and guards to app state logic
- archive and copy state machines with NSCoding

## When to choose
- you are building an Objective-C iOS or macOS app that needs finite state machine semantics
- you want a lightweight, dependency-free state machine library with block callbacks
- you need strongly enforced transitions with runtime validation

## When to avoid
- you are writing Swift and prefer a Swift-native state machine library
- your project no longer targets legacy iOS/OS X versions supported by this 2017-era release
- you need distributed or hierarchical statecharts rather than simple flat state machines

## Facets
- artifact type: library
- maturity: maintenance
- function: state-management, developer-tools
- domain: developer-tools, mobile-development, desktop-applications
- platform: -
- tags: state-machine, objective-c, cocoapods, block-based-api, finite-state-machine, ios, macos

## Member repositories
- blakewatters/TransitionKit (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:21.915601+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 2026-08-30T04:47:17.004691+00:00, confidence not recorded.
  - readme: https://github.com/blakewatters/TransitionKit (fetched 2026-08-28T04:04:21.915601+00:00, sha 2a5860d21e74)
- Data as of 2026-08-30T08:39:29.467469+00:00.