Reactive Programming in Swift
Swift Objective-C Other
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Miss Electric Eel 2016 RxSwift: ReactiveX for Swift

Travis CI platforms pod Carthage compatible

About Rx

⚠️ This readme describes RxSwift 3.0 version that requires Swift 3.0⚠️

⚠️ If you are looking for Swift 2.3 compatible version, please take a look at RxSwift ~> 2.0 versions and swift-2.3 branch ⚠️

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/OSX environment.

Cross platform documentation can be found on

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
    .throttle(0.3, scheduler: MainScheduler.instance)
    .flatMapLatest { query -> Observable<[Repository]> in
        if query.isEmpty {
            return Observable.just([])

        return searchGitHub(query)
... then bind the results to your tableview
    .bindTo(tableView.rx.items(cellIdentifier: "Cell")) {
        (index, repository: Repository, cell) in
        cell.textLabel?.text =
        cell.detailTextLabel?.text = repository.url


  • Xcode 8.0 beta 6 (8S201h)
  • Swift 3.0

  • iOS 8.0+

  • Mac OS X 10.10+
  • tvOS 9.0+
  • watchOS 2.0+


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


# Podfile

target 'YOUR_TARGET_NAME' do
    pod 'RxSwift',    '~> 3.0.0.alpha.1'
    pod 'RxCocoa',    '~> 3.0.0.alpha.1'

# RxTests and RxBlocking make the most sense in the context of unit/integration tests
    pod 'RxBlocking', '~> 3.0.0.alpha.1'
    pod 'RxTests',    '~> 3.0.0.alpha.1'

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

⚠️ If you want to use CocoaPods with Xcode 8.0 beta and Swift 3.0, you might need to add the following lines to your podfile: ⚠️

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['SWIFT_VERSION'] = '3.0'
      config.build_settings['MACOSX_DEPLOYMENT_TARGET'] = '10.10'
$ pod install


Add this to Cartfile

github "ReactiveX/RxSwift" "3.0.0.alpha.1"
$ carthage update

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-[Platform] and RxCocoa-[Platform] targets