Swiftpack.co - Package - ReactiveX/RxSwift

Miss Electric Eel 2016 RxSwift: ReactiveX for Swift

Travis CI platforms pod Carthage compatible Swift Package Manager compatible

Rx is a generic abstraction of computation expressed through Observable<Element> interface.

This is a Swift version of Rx.

It tries to port as many concepts from the original version as possible, but some concepts were adapted for more pleasant and performant integration with iOS/macOS environment.

Cross platform documentation can be found on ReactiveX.io.

Like the original Rx, its intention is to enable easy composition of asynchronous operations and event/data streams.

KVO observing, async operations and streams 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
... find compatible
... see the broader vision
  • Does this exist for Android? RxJava
  • Where is all of this going, what is the future, what about reactive architectures, how do you design entire apps this way? Cycle.js - this is javascript, but RxJS is javascript version of Rx.


Here's an example In Action
Define search for GitHub repositories ...
let searchResults = searchBar.rx.text.orEmpty
    .throttle(0.3, scheduler: MainScheduler.instance)
    .flatMapLatest { query -> Observable<[Repository]> in
        if query.isEmpty {
            return .just([])
        return searchGitHub(query)
... 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)



Rx doesn't contain any external dependencies.

These are currently the supported options:


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


Tested with pod --version: 1.3.1

# Podfile

target 'YOUR_TARGET_NAME' do
    pod 'RxSwift',    '~> 4.0'
    pod 'RxCocoa',    '~> 4.0'

# RxTest and RxBlocking make the most sense in the context of unit/integration tests
    pod 'RxBlocking', '~> 4.0'
    pod 'RxTest',     '~> 4.0'

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

$ pod install


Tested with carthage version: 0.26.2

Add this to Cartfile

github "ReactiveX/RxSwift" ~> 4.0
$ carthage update

Swift Package Manager

Tested with swift build --version: Swift 4.0.0-dev (swiftpm-13126)

Create a Package.swift file.

// swift-tools-version:4.0

import PackageDescription

let package = Package(
  name: "RxTestProject",
  dependencies: [
    .package(url: "https://github.com/ReactiveX/RxSwift.git", "4.0.0" ..< "5.0.0")
  targets: [
    .target(name: "RxTestProject", dependencies: ["RxSwift", "RxCocoa"])
$ swift build

To build or test a module with RxTest dependency, set TEST=1. (RxSwift >= 3.4.2)

$ 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-[Platform] and RxCocoa-[Platform] targets



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4.4.0 - Nov 2, 2018

This relase introduces new framework RxAtomic that enables using C11 atomic primities in RxSwift as a replacement for deprecated OSAtomic* functions. Carthage users will probably need to include this framework manually.

  • Updates deprecated OSAtomic* primitives to use C11 atomic primitives.
  • Adds Event, SingleEvent, MaybeEvent and Recorded conditional conformance to Equatable where their Element is equatable on RXTest for clients that are using Swift >= 4.1.
  • Adds string to NSTextView.
  • Consolidates per platform frameworks to multi-platform frameworks.
  • Xcode 10.1 compatible.


  • Fixes problem with canceling events scheduled on serial scheduler through observeOn operator. #1778
  • Fixes problem with UISearchBar.text property not triggering update when cancel button is tapped. #1714
  • Updates watchos minimum target to 3.0. #1752

4.3.1 - Sep 21, 2018


  • Fixes issues with CocoaPods and Swift 4.2 version.

4.3.0 - Sep 16, 2018

  • Compatibility with Xcode 10.0
  • Adds new insert extension to collect and add multiple disposables to DisposeBag.
  • Adds scan(into:accumulator:).
  • Adds queuePriority parameter (defaults to .normal) to OperationQueueScheduler.
  • Performance enhancement reduces Bag dispatch inline code size by 12%.
  • Adds customCaptureSubscriptionCallstack hook to allow custom subscription callstacks to be generated.
  • Remove usage of Variable from Playground, Example projects and Tests.
  • Add XCTAssertRecordedElements to XCTest+Rx.


  • Fix build issues on new arm64_32 architecture (watchOS 5).
  • Removes string interpolation warning.

4.2.0 - Jun 8, 2018

  • Adds Smart Key Path subscripting to create a binder for property of object.
  • Adds UICollectionView extensions:
    • prefetchItems
    • cancelPrefetchingForItems
  • Adds UITableView extensions:
    • prefetchRows
    • cancelPrefetchingForRows
  • Fixes various spelling mistakes and missing parameters.
  • Adds UISegmentedControlExtensions:
    • titleForSegment(at:)
    • imageForSegment(at:)
  • Adds Maybe.ifEmpty(default:) operator.
  • Adds Maybe.ifEmpty(switchTo:) operator.
  • Adds Maybe.catchErrorJustReturn(_:) operator.
  • Add Single.flatMapMaybe(_:) operator.
  • Add Single.flatMapCompletable(_:) operator.
  • Add Single.zip(_:) operator.
  • Add Single.catchErrorJustReturn(_:) operator.
  • Add Single.asMaybe(_:) operator.
  • Add Single.asCompletable(_:) operator.


  • Lower macOS Deployment Target to 10.9
  • Deprecates UISegmentedControl.enabled(forSegmentAt:) in favor of UISegmentedControl.enabledForSegment(at:).

4.1.2 - Feb 4, 2018

  • Adds deprecation warner.


  • Fixes ambiguity issue with Single.do(onNext:onError:onSubscribe:onSubscribed:onDispose:) and Single.do(onSuccess:onError:onSubscribe:onSubscribed:onDispose:).