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Reactive Programming in Swift

RxSwift Logo
Build Status Supported Platforms: iOS, macOS, tvOS, watchOS & Linux

Rx is a generic abstraction of computation expressed through Observable<Element> interface, which lets you broadcast and subscribe to values and other events from an Observable stream.

RxSwift is the Swift-specific implementation of the Reactive Extensions standard.

RxSwift Observable Example of a price constantly changing and updating the app's UI

While this version aims to stay true to the original spirit and naming conventions of Rx, this projects also aims to provide a true Swift-first API for Rx APIs.

Cross platform documentation can be found on ReactiveX.io.

Like other Rx implementation, RxSwift's intention is to enable easy composition of asynchronous operations and streams of data in the form of Observable objects and a suite of methods to transform and compose these pieces of asynchronous work.

KVO observation, async operations, UI Events and other streams of data are all unified under abstraction of sequence. This is the reason why Rx is so simple, elegant and powerful.

I came here because I want to ...

... understand
... install
... hack around
... interact
... compare
... understand the structure

RxSwift is as compositional as the asynchronous work it drives. The core unit is RxSwift itself, while other dependencies can be added for UI Work, testing, and more.

It comprises five separate components depending on each other in the following way:

┌──────────────┐    ┌──────────────┐
│   RxCocoa    ├────▶   RxRelay    │
└───────┬──────┘    └──────┬───────┘
        │                  │        
│             RxSwift              │
        │                  │        
┌───────┴──────┐    ┌──────┴───────┐
│    RxTest    │    │  RxBlocking  │
└──────────────┘    └──────────────┘
  • RxSwift: The core of RxSwift, providing the Rx standard as (mostly) defined by ReactiveX. It has no other dependencies.
  • RxCocoa: Provides Cocoa-specific capabilities for general iOS/macOS/watchOS & tvOS app development, such as Shared Sequences, Traits, and much more. It depends on both RxSwift and RxRelay.
  • RxRelay: Provides PublishRelay, BehaviorRelay and ReplayRelay, three simple wrappers around Subjects. It depends on RxSwift.
  • RxTest and RxBlocking: Provides testing capabilities for Rx-based systems. It depends on RxSwift.


Here's an example In Action
Define search for GitHub repositories ...
let searchResults = searchBar.rx.text.orEmpty
    .throttle(.milliseconds(300), scheduler: MainScheduler.instance)
    .flatMapLatest { query -> Observable<[Repository]> in
        if query.isEmpty {
            return .just([])
        return searchGitHub(query)
    .observe(on: MainScheduler.instance)
... then bind the results to your tableview
    .bind(to: tableView.rx.items(cellIdentifier: "Cell")) {
        (index, repository: Repository, cell) in
        cell.textLabel?.text = repository.name
        cell.detailTextLabel?.text = repository.url
    .disposed(by: disposeBag)


  • Xcode 12.x
  • Swift 5.x

For Xcode 11 and below, use RxSwift 5.x.


RxSwift doesn't contain any external dependencies.

These are currently the supported installation options:


Open Rx.xcworkspace, choose RxExample and hit run. This method will build everything and run the sample app


# Podfile

target 'YOUR_TARGET_NAME' do
    pod 'RxSwift', '6.0.0'
    pod 'RxCocoa', '6.0.0'

# RxTest and RxBlocking make the most sense in the context of unit/integration tests
    pod 'RxBlocking', '6.0.0'
    pod 'RxTest', '6.0.0'

Replace YOUR_TARGET_NAME and then, in the Podfile directory, type:

$ pod install


Each release starting with RxSwift 6 includes *.xcframework framework binaries. Simply drag the needed framework binaries to your Frameworks, Libraries, and Embedded Content section under your target's General tab.

XCFrameworks instructions


Add this to Cartfile

github "ReactiveX/RxSwift" "6.0.0"
$ carthage update

Carthage as a Static Library

Carthage defaults to building RxSwift as a Dynamic Library.

If you wish to build RxSwift as a Static Library using Carthage you may use the script below to manually modify the framework type before building with Carthage:

carthage update RxSwift --platform iOS --no-build
sed -i -e 's/MACH_O_TYPE = mh_dylib/MACH_O_TYPE = staticlib/g' Carthage/Checkouts/RxSwift/Rx.xcodeproj/project.pbxproj
carthage build RxSwift --platform iOS

Swift Package Manager

Note: There is a critical cross-dependency bug affecting many projects including RxSwift in Swift Package Manager. We've filed a bug (SR-12303) in early 2020 but have no answer yet. Your mileage may vary. A partial workaround can be found here.

Create a Package.swift file.

// swift-tools-version:5.0

import PackageDescription

let package = Package(
  name: "RxTestProject",
  dependencies: [
    .package(url: "https://github.com/ReactiveX/RxSwift.git", .exact("6.0.0"))
  targets: [
    .target(name: "RxTestProject", dependencies: ["RxSwift", "RxCocoa"])
$ swift build

To build or test a module with RxTest dependency, set TEST=1.

$ TEST=1 swift test

Manually using git submodules

  • Add RxSwift as a submodule
$ git submodule add git@github.com:ReactiveX/RxSwift.git
  • Drag Rx.xcodeproj into Project Navigator
  • Go to Project > Targets > Build Phases > Link Binary With Libraries, click + and select RxSwift, RxCocoa and RxRelay targets



Stars: 19572
Last commit: Yesterday


Ethan - 2021-01-01T14:13:46

RxSwift 6 is here!

New year, new version, new logo - such an exciting day! 🥳

RxSwift Logo

To get a glimpse of what this new major version packs, check out the following blog post: What's new in RxSwift 6

Note: RxSwift 6 supports Xcode 12 and Swift 5.3 and has a minimum deployment target of iOS 9.

  • All ReactiveCompatible objects (.rx namespace) get Binders for all properties for free using @dynamicMemberLookup.
  • New Infallible object which is identical to Observable with the guarantee of never failing.
  • Add variadic drive() and emit() to multiple observers and relays.
  • New decode(type:decoder:) operator for ObsrvableTypes of Data.
  • SingleEvent is now simply Result<Element, Swift.Error> and methods changed accordingly (e.g. subscribe(onSuccess:onFailure:)).
  • Add ReplayRelay.
  • Add new withUnretained(_:) operator.
  • Add distinctUntilChanged(at keyPath:).
  • Add UIApplication Reactive extensions .
  • Rename catchError(_:) to catch(_:).
  • Rename catchErrorJustReturn(_:) to catchAndReturn(_:).
  • Rename elementAt(_:) to element(at:).
  • Rename retryWhen(_:) to retry(when:).
  • Rename takeUntil(_:) to take(until:) and takeUntil(behavior:_:) to take(until:behavior:).
  • Rename takeWhile(_:) to take(while:) and takeWhile(behavior:_:) to take(while:behavior:).
  • Rename take(_:) duration overload to take(for:) (e.g. take(for: .seconds(3))).
  • Rename skipWhile(_:) to skip(while:).
  • Rename takeUntil(_:) to take(until:).
  • Rename observeOn and subscribeOn to observe(on:) and subscribe(on:).
  • ignoreElements() now returns Observable<Never>.
  • Make SharedSequence conform to ObservableConvertibleType.
  • Add onDisposed to Maybe, Completable and Single.
  • Unify and optimize swizzling extensions into a single one.
  • Add DisposeBag function builder to allow easy comma-less initialization of a DisposeBag.
  • Advance support of XCFrameworks by enabling BUILD_LIBRARY_FOR_DISTRIBUTION and cleaning up.
  • Move URLSession logging settings to a more appropriate URLSession.rx.shouldLogRequest configurable closure.
  • Many, many, many quality of life bugs and fixes.