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

    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 =
            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', '6.5.0'
        pod 'RxCocoa', '6.5.0'
    # RxTest and RxBlocking make the most sense in the context of unit/integration tests
    target 'YOUR_TESTING_TARGET' do
        pod 'RxBlocking', '6.5.0'
        pod 'RxTest', '6.5.0'

    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.

    Note: If you're using RxCocoa, be sure to also drag RxCocoaRuntime.xcframework before importing RxCocoa.

    XCFrameworks instructions


    Add this to Cartfile

    github "ReactiveX/RxSwift" "6.5.0"
    $ 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: "", .exact("6.5.0"))
      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
    • Drag Rx.xcodeproj into Project Navigator
    • Go to Project > Targets > Build Phases > Link Binary With Libraries, click + and select RxSwift, RxCocoa and RxRelay targets



    Reactive Programming in Swift

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