Streams of values over time

What's New



This is the third minor release of ReactiveSwift 6.


  1. Property and MutableProperty can now be used as property wrapper. Note that they remain a reference type container, so it may not be appropriate to use them in types requiring value semantics. (#781)

    class ViewModel {
      @MutableProperty var count: Int = 0
      func subscribe() {
        self.$count.producer.startWithValues {
          print("`count` has changed to \(count)")
      func increment() {
        print("count prior to increment: \(count)")
        self.$count.modify { $0 += 1 }
  2. When combineLatest or zip over a sequence of SignalProducers or Propertys, you can now specify an optional emptySentinel parameter, which would be used when the sequence is empty.

    This becomes relevant, when the sequence of producers is calculated from some other Signal and the signal resulting from the joined producers is observed. If no value is sent when the sequence is empty, the observer gets terminated silently, and, e.g., the UI would not be updated.

    (#774, kudos to @rocketnik)


  1. Test dependencies should no longer be built for SwiftPM users, as a result of ReactiveSwift moving to swft-tools-version: 5.2. (#784)


Streams of values over time. Tailored for Swift.

Latest ReactiveSwift Documentation Join the ReactiveSwift Slack community.

Carthage compatible CocoaPods compatible SwiftPM compatible GitHub release Swift 5.1 platforms

🎉 Getting Started 🚄 Release Roadmap

What is ReactiveSwift?

ReactiveSwift offers composable, declarative and flexible primitives that are built around the grand concept of streams of values over time.

These primitives can be used to uniformly represent common Cocoa and generic programming patterns that are fundamentally an act of observation, e.g. delegate pattern, callback closures, notifications, control actions, responder chain events, futures/promises and key-value observing (KVO).

Because all of these different mechanisms can be represented in the same way, it’s easy to declaratively compose them together, with less spaghetti code and state to bridge the gap.

Getting Started

  1. Core Reactive Primitives

    An overview of the semantics and example use cases of the ReactiveSwift primitives, including Signal, SignalProducer, Property and Action.

  2. Basic Operators

    An overview of the operators provided to compose and transform streams of values.

  3. ReactiveCocoa

    Building on top of ReactiveSwift, ReactiveCocoa extends Cocoa platform frameworks with reactive bindings and extensions.

    GitHub releaseCarthage compatible CocoaPods compatible

  4. How does ReactiveSwift relate to RxSwift?

    An overview of how ReactiveSwift differs from RxSwift for Swift idiomaticity.


  1. Interactive Form UI

    ReactiveSwift includes a UI Examples playground, which demonstrates:

    • how to build an interactive form UI with bindings, properties and Actions, with a live view in action.
    • how to use reactive primitives to implement the Model-View-ViewModel architectural pattern, with the View Model being the source of truth for the View.
  2. Online Searching

Advanced Topics

  1. ReactiveCocoa

    Bindings and reactive extensions for Cocoa and Cocoa Touch frameworks are offered separately as ReactiveCocoa.

  2. API Reference

  3. API Contracts

    Contracts of the ReactiveSwift primitives, Best Practices with ReactiveSwift, and Guidelines on implementing custom operators.

  4. Debugging Techniques


ReactiveSwift supports macOS 10.9+, iOS 8.0+, watchOS 2.0+, tvOS 9.0+ and Linux.


If you use Carthage to manage your dependencies, simply add ReactiveSwift to your Cartfile:

github "ReactiveCocoa/ReactiveSwift" ~> 6.1

If you use Carthage to build your dependencies, make sure you have added ReactiveSwift.framework to the "Linked Frameworks and Libraries" section of your target, and have included them in your Carthage framework copying build phase.


If you use CocoaPods to manage your dependencies, simply add ReactiveSwift to your Podfile:

pod 'ReactiveSwift', '~> 6.1'

Swift Package Manager

If you use Swift Package Manager, simply add ReactiveSwift as a dependency of your package in Package.swift:

.package(url: "", from: "6.1.0")

Git submodule

  1. Add the ReactiveSwift repository as a submodule of your application’s repository.
  2. Run git submodule update --init --recursive from within the ReactiveCocoa folder.
  3. Drag and drop ReactiveSwift.xcodeproj into your application’s Xcode project or workspace.
  4. On the “General” tab of your application target’s settings, add ReactiveSwift.framework to the “Embedded Binaries” section.
  5. If your application target does not contain Swift code at all, you should also set the EMBEDDED_CONTENT_CONTAINS_SWIFT build setting to “Yes”.


We also provide a great Playground, so you can get used to ReactiveCocoa's operators. In order to start using it:

  1. Clone the ReactiveSwift repository.
  2. Retrieve the project dependencies using one of the following terminal commands from the ReactiveSwift project root directory:
    • git submodule update --init --recursive OR, if you have Carthage installed
    • carthage checkout
  3. Open ReactiveSwift.xcworkspace
  4. Build ReactiveSwift-macOS scheme
  5. Finally open the ReactiveSwift.playground
  6. Choose View > Show Debug Area

Have a question?

If you need any help, please visit our GitHub issues or Stack Overflow. Feel free to file an issue if you do not manage to find any solution from the archives.

Release Roadmap

Current Stable Release:
GitHub release

Plan of Record

ABI stability release

ReactiveSwift is expected to declare library ABI stability when Swift rolls out resilence support. Until then, ReactiveSwift would incrementally adopt new language features that help move towards to goal.


  • Swift Tools 5.2.0


Last updated: Thu Mar 04 2021 13:11:23 GMT-0500 (GMT-05:00)