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199 lines
7.2 KiB
Markdown
199 lines
7.2 KiB
Markdown
<img src="assets/Rx_Logo_M.png" alt="Miss Electric Eel 2016" width="36" height="36"> RxSwift: ReactiveX for Swift
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======================================
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[](https://travis-ci.org/ReactiveX/RxSwift)   [](https://github.com/Carthage/Carthage)
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## About Rx
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**:warning: This readme describes RxSwift 3.0 version that requires Swift 3.0.**
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**:warning: If you are looking for Swift 2.3 compatible version, please take a look at RxSwift ~> 2.0 versions and [swift-2.3](https://github.com/ReactiveX/RxSwift/tree/rxswift-2.0) branch.**
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Rx is a [generic abstraction of computation](https://youtu.be/looJcaeboBY) expressed through `Observable<Element>` interface.
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This is a Swift version of [Rx](https://github.com/Reactive-Extensions/Rx.NET).
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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.
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Cross platform documentation can be found on [ReactiveX.io](http://reactivex.io/).
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Like the original Rx, its intention is to enable easy composition of asynchronous operations and event/data streams.
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KVO observing, async operations and streams are all unified under [abstraction of sequence](Documentation/GettingStarted.md#observables-aka-sequences). This is the reason why Rx is so simple, elegant and powerful.
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## I came here because I want to ...
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###### ... understand
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* [why use rx?](Documentation/Why.md)
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* [the basics, getting started with RxSwift](Documentation/GettingStarted.md)
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* [units](Documentation/Units.md) - what is `Driver`, `ControlProperty`, and `Variable` ... and why do they exist?
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* [testing](Documentation/UnitTests.md)
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* [tips and common errors](Documentation/Tips.md)
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* [debugging](Documentation/GettingStarted.md#debugging)
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* [the math behind Rx](Documentation/MathBehindRx.md)
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* [what are hot and cold observable sequences?](Documentation/HotAndColdObservables.md)
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* [what does the the public API look like?](Documentation/API.md)
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###### ... install
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* Integrate RxSwift/RxCocoa with my app. [Installation Guide](#installation)
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###### ... hack around
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* with the example app. [Running Example App](Documentation/ExampleApp.md)
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* with operators in playgrounds. [Playgrounds](Documentation/Playgrounds.md)
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###### ... interact
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* All of this is great, but it would be nice to talk with other people using RxSwift and exchange experiences. <br />[](http://slack.rxswift.org) [Join Slack Channel](http://rxswift-slack.herokuapp.com)
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* Report a problem using the library. [Open an Issue With Bug Template](ISSUE_TEMPLATE.md)
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* Request a new feature. [Open an Issue With Feature Request Template](Documentation/NewFeatureRequestTemplate.md)
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###### ... compare
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* [with other libraries](Documentation/ComparisonWithOtherLibraries.md).
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###### ... find compatible
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* libraries from [RxSwiftCommunity](https://github.com/RxSwiftCommunity).
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* [Pods using RxSwift](https://cocoapods.org/?q=uses%3Arxswift).
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###### ... see the broader vision
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* Does this exist for Android? [RxJava](https://github.com/ReactiveX/RxJava)
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* Where is all of this going, what is the future, what about reactive architectures, how do you design entire apps this way? [Cycle.js](https://github.com/cyclejs/cycle-core) - this is javascript, but [RxJS](https://github.com/Reactive-Extensions/RxJS) is javascript version of Rx.
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## Usage
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<table>
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<tr>
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<th width="30%">Here's an example</th>
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<th width="30%">In Action</th>
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</tr>
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<tr>
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<td>Define search for GitHub repositories ...</td>
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<th rowspan="9"><img src="https://raw.githubusercontent.com/kzaher/rxswiftcontent/master/GithubSearch.gif"></th>
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</tr>
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<tr>
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<td><div class="highlight highlight-source-swift"><pre>
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let searchResults = searchBar.rx.text
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.throttle(0.3, scheduler: MainScheduler.instance)
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.distinctUntilChanged()
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.flatMapLatest { query -> Observable<[Repository]> in
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if query.isEmpty {
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return .just([])
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}
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return searchGitHub(query)
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.catchErrorJustReturn([])
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}
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.observeOn(MainScheduler.instance)</pre></div></td>
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</tr>
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<tr>
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<td>... then bind the results to your tableview</td>
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</tr>
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<tr>
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<td width="30%"><div class="highlight highlight-source-swift"><pre>
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searchResults
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.bindTo(tableView.rx.items(cellIdentifier: "Cell")) {
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(index, repository: Repository, cell) in
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cell.textLabel?.text = repository.name
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cell.detailTextLabel?.text = repository.url
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}
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.addDisposableTo(disposeBag)</pre></div></td>
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</tr>
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</table>
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## Requirements
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* Xcode 8.0
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* Swift 3.0
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## Installation
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Rx doesn't contain any external dependencies.
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These are currently the supported options:
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### Manual
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Open Rx.xcworkspace, choose `RxExample` and hit run. This method will build everything and run the sample app
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### [CocoaPods](https://guides.cocoapods.org/using/using-cocoapods.html)
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```
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# Podfile
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use_frameworks!
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target 'YOUR_TARGET_NAME' do
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pod 'RxSwift', '3.0.0-beta.2'
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pod 'RxCocoa', '3.0.0-beta.2'
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end
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# RxTests and RxBlocking make the most sense in the context of unit/integration tests
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target 'YOUR_TESTING_TARGET' do
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pod 'RxBlocking', '3.0.0-beta.2'
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pod 'RxTests', '3.0.0-beta.2'
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end
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```
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Replace `YOUR_TARGET_NAME` and then, in the `Podfile` directory, type:
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**:warning: If you want to use CocoaPods with Xcode 8.0 beta and Swift 3.0, you might need to add the following
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lines to your podfile: :warning:**
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```
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post_install do |installer|
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installer.pods_project.targets.each do |target|
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target.build_configurations.each do |config|
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config.build_settings['SWIFT_VERSION'] = '3.0'
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config.build_settings['MACOSX_DEPLOYMENT_TARGET'] = '10.10'
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end
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end
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end
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```
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```
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$ pod install
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```
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### [Carthage](https://github.com/Carthage/Carthage)
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Add this to `Cartfile`
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```
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github "ReactiveX/RxSwift" "3.0.0-beta.2"
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```
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```
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$ carthage update
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```
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### Manually using git submodules
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* Add RxSwift as a submodule
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```
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$ git submodule add git@github.com:ReactiveX/RxSwift.git
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```
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* Drag `Rx.xcodeproj` into Project Navigator
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* Go to `Project > Targets > Build Phases > Link Binary With Libraries`, click `+` and select `RxSwift-[Platform]` and `RxCocoa-[Platform]` targets
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## References
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* [http://reactivex.io/](http://reactivex.io/)
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* [Reactive Extensions GitHub (GitHub)](https://github.com/Reactive-Extensions)
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* [Erik Meijer (Wikipedia)](http://en.wikipedia.org/wiki/Erik_Meijer_%28computer_scientist%29)
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* [Expert to Expert: Brian Beckman and Erik Meijer - Inside the .NET Reactive Framework (Rx) (video)](https://youtu.be/looJcaeboBY)
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* [Reactive Programming Overview (Jafar Husain from Netflix)](https://www.youtube.com/watch?v=dwP1TNXE6fc)
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* [Subject/Observer is Dual to Iterator (paper)](http://csl.stanford.edu/~christos/pldi2010.fit/meijer.duality.pdf)
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* [Rx standard sequence operators visualized (visualization tool)](http://rxmarbles.com/)
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* [Haskell](https://www.haskell.org/)
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