# facebook/kvocontroller

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_How this analysis was created: the description and tags below were written by an AI model that read this project's README and public documentation pages; stars, license and language come straight from the GitHub API. The model does not read the source code._

7,291 stars · 915 forks · Objective-C · NOASSERTION · archived

## Links

- GitHub: https://github.com/facebook/KVOController
- awesome-repositories: https://awesome-repositories.com/repository/facebook-kvocontroller.md

## Description

KVOController is a thread-safe Objective-C library that serves as a wrapper for Cocoa key-value observing. It manages the monitoring of object property changes and automates the registration and removal of observers.

The project focuses on memory safety by tying observer lifecycles to the controller, ensuring observers are removed upon deallocation to prevent leaks and crashes. It includes a thread-safe observation guard to prevent race conditions and observer resurrection when monitoring properties across multiple threads.

The library maps object property paths to handler methods, triggering notifications through blocks or custom actions. This coordination allows for the synchronization of data models with user interfaces.

## Tags

### Software Engineering & Architecture

- [Property Change Observers](https://awesome-repositories.com/f/software-engineering-architecture/architectural-design-patterns/state-management/change-detection/property-change-observers.md) — Implements a thread-safe wrapper around Cocoa key-value observing to monitor object property changes.
- [Block-Based Property Observers](https://awesome-repositories.com/f/software-engineering-architecture/architectural-design-patterns/state-management/change-detection/property-change-observers/block-based-property-observers.md) — Provides block-based property observation to eliminate the need for manual observer management.
- [Thread-Safe Observation State](https://awesome-repositories.com/f/software-engineering-architecture/background-thread-dispatchers/thread-safe-dispatchers/thread-safe-state-transitions/thread-safe-observation-state.md) — Watches object property changes across multiple threads while preventing race conditions and observer resurrection.
- [KVO Wrappers](https://awesome-repositories.com/f/software-engineering-architecture/kvo-wrappers.md) — Provides a thread-safe interface for monitoring object property changes using the Cocoa key-value observing mechanism.
- [Memory Leak Prevention](https://awesome-repositories.com/f/software-engineering-architecture/memory-usage-analysis/memory-leak-prevention.md) — Handles the lifecycle of observers to ensure they are removed when controllers are destroyed to prevent memory leaks.
- [Lifecycle-Aware Data Observers](https://awesome-repositories.com/f/software-engineering-architecture/memory-usage-analysis/memory-leak-prevention/adapter-observer-leak-preventers/lifecycle-aware-data-observers.md) — Automatically removes observers upon controller deallocation to prevent crashes and memory leaks. ([source](https://github.com/facebook/kvocontroller#readme))
- [Controller-Bound Observers](https://awesome-repositories.com/f/software-engineering-architecture/observer-patterns/disposable-observers/lifecycle-event-observers/lifecycle-aware-data-observers/controller-bound-observers.md) — Automatically manages observer registration and removal by tying them to the controller lifecycle to prevent memory leaks.
- [Observation Guarding](https://awesome-repositories.com/f/software-engineering-architecture/thread-safe-logging/thread-safe-assertion-recording/thread-safe-registries/observation-guarding.md) — Prevents race conditions and crashes during observer registration and removal across multiple threads.
- [Observer Management Registries](https://awesome-repositories.com/f/software-engineering-architecture/thread-safe-logging/thread-safe-assertion-recording/thread-safe-registries/observer-management-registries.md) — Provides a memory-safe observer manager that prevents race conditions and automates observer removal during deallocation.
- [Value Change Triggers](https://awesome-repositories.com/f/software-engineering-architecture/architectural-design-patterns/state-management/change-detection/value-change-triggers.md) — Monitors object property updates across multiple threads and triggers callbacks when values change. ([source](https://github.com/facebook/kvocontroller#readme))
- [Key-Path Property Mapping](https://awesome-repositories.com/f/software-engineering-architecture/key-path-property-mapping.md) — Maps object property paths to corresponding handler methods within a controller instance for efficient property monitoring.
- [Object Property Monitoring](https://awesome-repositories.com/f/software-engineering-architecture/object-property-monitoring.md) — Watches specific object properties and triggers notifications via blocks, custom actions, or callbacks. ([source](https://github.com/facebook/kvocontroller#readme))

### Programming Languages & Runtimes

- [Objective-C Libraries](https://awesome-repositories.com/f/programming-languages-runtimes/programming-language-varieties/programming-languages/language-specific-resources/apple-platform-languages/objective-c-libraries.md) — Provides an observation library for tracking property updates using blocks and custom actions in Objective-C.

### Part of an Awesome List

- [Learning & Reference](https://awesome-repositories.com/f/awesome-lists/learning/learning-reference.md) — Safe KVO implementation.