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**The MIT License**
**Copyright © 2015 Krunoslav Zaher, Shai Mishali**
**All rights reserved.**
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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<p align="center">
<img src="assets/RxSwift_Logo.png" width="35%" alt="RxSwift Logo" />
<br />
<a href="https://actions-badge.atrox.dev/ReactiveX/RxSwift/goto" target="_blank"><img src="https://github.com/ReactiveX/RxSwift/workflows/RxSwift/badge.svg?branch=main" alt="Build Status" /></a>
<img src="https://img.shields.io/badge/platforms-iOS%20%7C%20macOS%20%7C%20tvOS%20%7C%20watchOS%20%7C%20Linux-333333.svg" alt="Supported Platforms: iOS, macOS, tvOS, watchOS & Linux" />
<br />
<a href="https://cocoapods.org/pods/RxSwift" alt="RxSwift on CocoaPods" title="RxSwift on CocoaPods"><img src="https://img.shields.io/cocoapods/v/RxSwift.svg" /></a>
<a href="https://github.com/Carthage/Carthage" alt="RxSwift on Carthage" title="RxSwift on Carthage"><img src="https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat" /></a>
<a href="https://github.com/apple/swift-package-manager" alt="RxSwift on Swift Package Manager" title="RxSwift on Swift Package Manager"><img src="https://img.shields.io/badge/Swift%20Package%20Manager-compatible-brightgreen.svg" /></a>
</p>
Rx is a [generic abstraction of computation](https://youtu.be/looJcaeboBY) 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](http://reactivex.io) standard.
<p align="center"><img src="assets/example.png" width="55%" alt="RxSwift Observable Example of a price constantly changing and updating the app's UI" /></p>
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](http://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](Documentation/GettingStarted.md#observables-aka-sequences). This is the reason why Rx is so simple, elegant and powerful.
## I came here because I want to ...
###### ... understand
* [why use rx?](Documentation/Why.md)
* [the basics, getting started with RxSwift](Documentation/GettingStarted.md)
* [traits](Documentation/Traits.md) - what are `Single`, `Completable`, `Maybe`, `Driver`, and `ControlProperty` ... and why do they exist?
* [testing](Documentation/UnitTests.md)
* [tips and common errors](Documentation/Tips.md)
* [debugging](Documentation/GettingStarted.md#debugging)
* [the math behind Rx](Documentation/MathBehindRx.md)
* [what are hot and cold observable sequences?](Documentation/HotAndColdObservables.md)
###### ... install
* Integrate RxSwift/RxCocoa with my app. [Installation Guide](#installation)
###### ... hack around
* with the example app. [Running Example App](Documentation/ExampleApp.md)
* with operators in playgrounds. [Playgrounds](Documentation/Playgrounds.md)
###### ... interact
* All of this is great, but it would be nice to talk with other people using RxSwift and exchange experiences. <br />[Join Slack Channel](http://slack.rxswift.org)
* Report a problem using the library. [Open an Issue With Bug Template](.github/ISSUE_TEMPLATE.md)
* Request a new feature. [Open an Issue With Feature Request Template](Documentation/NewFeatureRequestTemplate.md)
* Help out [Check out contribution guide](CONTRIBUTING.md)
###### ... compare
* [with Combine and ReactiveSwift](Documentation/ComparisonWithOtherLibraries.md).
###### ... 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:
```none
┌──────────────┐ ┌──────────────┐
│ RxCocoa ├────▶ RxRelay │
└───────┬──────┘ └──────┬───────┘
│ │
┌───────▼──────────────────▼───────┐
│ RxSwift │
└───────▲──────────────────▲───────┘
│ │
┌───────┴──────┐ ┌──────┴───────┐
│ RxTest │ │ RxBlocking │
└──────────────┘ └──────────────┘
```
* **RxSwift**: The core of RxSwift, providing the Rx standard as (mostly) defined by [ReactiveX](https://reactivex.io). 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](https://github.com/ReactiveX/RxSwift/blob/main/Documentation/Subjects.md#relays). It depends on `RxSwift`.
* **RxTest** and **RxBlocking**: Provides testing capabilities for Rx-based systems. It depends on `RxSwift`.
## Usage
<table>
<tr>
<th width="30%">Here's an example</th>
<th width="30%">In Action</th>
</tr>
<tr>
<td>Define search for GitHub repositories ...</td>
<th rowspan="9"><img src="https://raw.githubusercontent.com/kzaher/rxswiftcontent/master/GithubSearch.gif"></th>
</tr>
<tr>
<td><div class="highlight highlight-source-swift"><pre>
let searchResults = searchBar.rx.text.orEmpty
.throttle(.milliseconds(300), scheduler: MainScheduler.instance)
.distinctUntilChanged()
.flatMapLatest { query -> Observable&lt;[Repository]&gt; in
if query.isEmpty {
return .just([])
}
return searchGitHub(query)
.catchAndReturn([])
}
.observe(on: MainScheduler.instance)</pre></div></td>
</tr>
<tr>
<td>... then bind the results to your tableview</td>
</tr>
<tr>
<td width="30%"><div class="highlight highlight-source-swift"><pre>
searchResults
.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)</pre></div></td>
</tr>
</table>
## Requirements
* Xcode 12.x
* Swift 5.x
For Xcode 11 and below, [use RxSwift 5.x](https://github.com/ReactiveX/RxSwift/releases/tag/5.1.1).
## Installation
RxSwift doesn't contain any external dependencies.
These are currently the supported installation options:
### Manual
Open Rx.xcworkspace, choose `RxExample` and hit run. This method will build everything and run the sample app
### [CocoaPods](https://guides.cocoapods.org/using/using-cocoapods.html)
```ruby
# Podfile
use_frameworks!
target 'YOUR_TARGET_NAME' do
pod 'RxSwift', '6.5.0'
pod 'RxCocoa', '6.5.0'
end
# 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'
end
```
Replace `YOUR_TARGET_NAME` and then, in the `Podfile` directory, type:
```bash
$ pod install
```
### XCFrameworks
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`.
<img src="https://raw.githubusercontent.com/ReactiveX/RxSwift/main/assets/xcframeworks.png" alt="XCFrameworks instructions" width="65%">
### [Carthage](https://github.com/Carthage/Carthage)
Add this to `Cartfile`
```
github "ReactiveX/RxSwift" "6.5.0"
```
```bash
$ 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:
```bash
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](https://github.com/apple/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)](https://bugs.swift.org/browse/SR-12303) in early 2020 but have no answer yet. Your mileage may vary. A partial workaround can be found [here](https://github.com/ReactiveX/RxSwift/issues/2127#issuecomment-717830502).
Create a `Package.swift` file.
```swift
// swift-tools-version:5.0
import PackageDescription
let package = Package(
name: "RxTestProject",
dependencies: [
.package(url: "https://github.com/ReactiveX/RxSwift.git", .exact("6.5.0"))
],
targets: [
.target(name: "RxTestProject", dependencies: ["RxSwift", "RxCocoa"])
]
)
```
```bash
$ swift build
```
To build or test a module with RxTest dependency, set `TEST=1`.
```bash
$ TEST=1 swift test
```
### Manually using git submodules
* Add RxSwift as a submodule
```bash
$ 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
## References
* [http://reactivex.io/](http://reactivex.io/)
* [Reactive Extensions GitHub (GitHub)](https://github.com/Reactive-Extensions)
* [RxSwift RayWenderlich.com Book](https://store.raywenderlich.com/products/rxswift-reactive-programming-with-swift)
* [RxSwift: Debunking the myth of hard (YouTube)](https://www.youtube.com/watch?v=GdvLP0ZAhhc)
* [Boxue.io RxSwift Online Course](https://boxueio.com/series/rxswift-101) (Chinese 🇨🇳)
* [Expert to Expert: Brian Beckman and Erik Meijer - Inside the .NET Reactive Framework (Rx) (video)](https://youtu.be/looJcaeboBY)
* [Reactive Programming Overview (Jafar Husain from Netflix)](https://youtu.be/-8Y1-lE6NSA)
* [Subject/Observer is Dual to Iterator (paper)](http://csl.stanford.edu/~christos/pldi2010.fit/meijer.duality.pdf)
* [Rx standard sequence operators visualized (visualization tool)](http://rxmarbles.com/)
* [Haskell](https://www.haskell.org/)

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//
// BehaviorRelay.swift
// RxRelay
//
// Created by Krunoslav Zaher on 10/7/17.
// Copyright © 2017 Krunoslav Zaher. All rights reserved.
//
import RxSwift
/// BehaviorRelay is a wrapper for `BehaviorSubject`.
///
/// Unlike `BehaviorSubject` it can't terminate with error or completed.
public final class BehaviorRelay<Element>: ObservableType {
private let subject: BehaviorSubject<Element>
/// Accepts `event` and emits it to subscribers
public func accept(_ event: Element) {
self.subject.onNext(event)
}
/// Current value of behavior subject
public var value: Element {
// this try! is ok because subject can't error out or be disposed
return try! self.subject.value()
}
/// Initializes behavior relay with initial value.
public init(value: Element) {
self.subject = BehaviorSubject(value: value)
}
/// Subscribes observer
public func subscribe<Observer: ObserverType>(_ observer: Observer) -> Disposable where Observer.Element == Element {
self.subject.subscribe(observer)
}
/// - returns: Canonical interface for push style sequence
public func asObservable() -> Observable<Element> {
self.subject.asObservable()
}
}

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//
// Observable+Bind.swift
// RxRelay
//
// Created by Shai Mishali on 09/04/2019.
// Copyright © 2019 Krunoslav Zaher. All rights reserved.
//
import RxSwift
extension ObservableType {
/**
Creates new subscription and sends elements to publish relay(s).
In case error occurs in debug mode, `fatalError` will be raised.
In case error occurs in release mode, `error` will be logged.
- parameter relays: Target publish relays for sequence elements.
- returns: Disposable object that can be used to unsubscribe the observer.
*/
public func bind(to relays: PublishRelay<Element>...) -> Disposable {
bind(to: relays)
}
/**
Creates new subscription and sends elements to publish relay(s).
In case error occurs in debug mode, `fatalError` will be raised.
In case error occurs in release mode, `error` will be logged.
- parameter relays: Target publish relays for sequence elements.
- returns: Disposable object that can be used to unsubscribe the observer.
*/
public func bind(to relays: PublishRelay<Element?>...) -> Disposable {
self.map { $0 as Element? }.bind(to: relays)
}
/**
Creates new subscription and sends elements to publish relay(s).
In case error occurs in debug mode, `fatalError` will be raised.
In case error occurs in release mode, `error` will be logged.
- parameter relays: Target publish relays for sequence elements.
- returns: Disposable object that can be used to unsubscribe the observer.
*/
private func bind(to relays: [PublishRelay<Element>]) -> Disposable {
subscribe { e in
switch e {
case let .next(element):
relays.forEach {
$0.accept(element)
}
case let .error(error):
rxFatalErrorInDebug("Binding error to publish relay: \(error)")
case .completed:
break
}
}
}
/**
Creates new subscription and sends elements to behavior relay(s).
In case error occurs in debug mode, `fatalError` will be raised.
In case error occurs in release mode, `error` will be logged.
- parameter relays: Target behavior relay for sequence elements.
- returns: Disposable object that can be used to unsubscribe the observer.
*/
public func bind(to relays: BehaviorRelay<Element>...) -> Disposable {
self.bind(to: relays)
}
/**
Creates new subscription and sends elements to behavior relay(s).
In case error occurs in debug mode, `fatalError` will be raised.
In case error occurs in release mode, `error` will be logged.
- parameter relays: Target behavior relay for sequence elements.
- returns: Disposable object that can be used to unsubscribe the observer.
*/
public func bind(to relays: BehaviorRelay<Element?>...) -> Disposable {
self.map { $0 as Element? }.bind(to: relays)
}
/**
Creates new subscription and sends elements to behavior relay(s).
In case error occurs in debug mode, `fatalError` will be raised.
In case error occurs in release mode, `error` will be logged.
- parameter relays: Target behavior relay for sequence elements.
- returns: Disposable object that can be used to unsubscribe the observer.
*/
private func bind(to relays: [BehaviorRelay<Element>]) -> Disposable {
subscribe { e in
switch e {
case let .next(element):
relays.forEach {
$0.accept(element)
}
case let .error(error):
rxFatalErrorInDebug("Binding error to behavior relay: \(error)")
case .completed:
break
}
}
}
/**
Creates new subscription and sends elements to replay relay(s).
In case error occurs in debug mode, `fatalError` will be raised.
In case error occurs in release mode, `error` will be logged.
- parameter relays: Target replay relay for sequence elements.
- returns: Disposable object that can be used to unsubscribe the observer.
*/
public func bind(to relays: ReplayRelay<Element>...) -> Disposable {
self.bind(to: relays)
}
/**
Creates new subscription and sends elements to replay relay(s).
In case error occurs in debug mode, `fatalError` will be raised.
In case error occurs in release mode, `error` will be logged.
- parameter relays: Target replay relay for sequence elements.
- returns: Disposable object that can be used to unsubscribe the observer.
*/
public func bind(to relays: ReplayRelay<Element?>...) -> Disposable {
self.map { $0 as Element? }.bind(to: relays)
}
/**
Creates new subscription and sends elements to replay relay(s).
In case error occurs in debug mode, `fatalError` will be raised.
In case error occurs in release mode, `error` will be logged.
- parameter relays: Target replay relay for sequence elements.
- returns: Disposable object that can be used to unsubscribe the observer.
*/
private func bind(to relays: [ReplayRelay<Element>]) -> Disposable {
subscribe { e in
switch e {
case let .next(element):
relays.forEach {
$0.accept(element)
}
case let .error(error):
rxFatalErrorInDebug("Binding error to behavior relay: \(error)")
case .completed:
break
}
}
}
}

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//
// PublishRelay.swift
// RxRelay
//
// Created by Krunoslav Zaher on 3/28/15.
// Copyright © 2017 Krunoslav Zaher. All rights reserved.
//
import RxSwift
/// PublishRelay is a wrapper for `PublishSubject`.
///
/// Unlike `PublishSubject` it can't terminate with error or completed.
public final class PublishRelay<Element>: ObservableType {
private let subject: PublishSubject<Element>
// Accepts `event` and emits it to subscribers
public func accept(_ event: Element) {
self.subject.onNext(event)
}
/// Initializes with internal empty subject.
public init() {
self.subject = PublishSubject()
}
/// Subscribes observer
public func subscribe<Observer: ObserverType>(_ observer: Observer) -> Disposable where Observer.Element == Element {
self.subject.subscribe(observer)
}
/// - returns: Canonical interface for push style sequence
public func asObservable() -> Observable<Element> {
self.subject.asObservable()
}
}

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//
// ReplayRelay.swift
// RxRelay
//
// Created by Zsolt Kovacs on 12/22/19.
// Copyright © 2019 Krunoslav Zaher. All rights reserved.
//
import RxSwift
/// ReplayRelay is a wrapper for `ReplaySubject`.
///
/// Unlike `ReplaySubject` it can't terminate with an error or complete.
public final class ReplayRelay<Element>: ObservableType {
private let subject: ReplaySubject<Element>
// Accepts `event` and emits it to subscribers
public func accept(_ event: Element) {
self.subject.onNext(event)
}
private init(subject: ReplaySubject<Element>) {
self.subject = subject
}
/// Creates new instance of `ReplayRelay` that replays at most `bufferSize` last elements sent to it.
///
/// - parameter bufferSize: Maximal number of elements to replay to observers after subscription.
/// - returns: New instance of replay relay.
public static func create(bufferSize: Int) -> ReplayRelay<Element> {
ReplayRelay(subject: ReplaySubject.create(bufferSize: bufferSize))
}
/// Creates a new instance of `ReplayRelay` that buffers all the sent to it.
/// To avoid filling up memory, developer needs to make sure that the use case will only ever store a 'reasonable'
/// number of elements.
public static func createUnbound() -> ReplayRelay<Element> {
ReplayRelay(subject: ReplaySubject.createUnbounded())
}
/// Subscribes observer
public func subscribe<Observer: ObserverType>(_ observer: Observer) -> Disposable where Observer.Element == Element {
self.subject.subscribe(observer)
}
/// - returns: Canonical interface for push style sequence
public func asObservable() -> Observable<Element> {
self.subject.asObserver()
}
}

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//
// Utils.swift
// RxRelay
//
// Created by Shai Mishali on 09/04/2019.
// Copyright © 2019 Krunoslav Zaher. All rights reserved.
//
import Foundation
func rxFatalErrorInDebug(_ lastMessage: @autoclosure () -> String, file: StaticString = #file, line: UInt = #line) {
#if DEBUG
fatalError(lastMessage(), file: file, line: line)
#else
print("\(file):\(line): \(lastMessage())")
#endif
}