RxCombine

RxCombine provides bi-directional type bridging between RxSwift and Apple's Combine framework.

Note: This is highly experimental, and basically just a quickly-put-together PoC. I gladly accept PRs, ideas, opinions, or improvements. Thank you ! :)

Basic Examples

Check out the Example App in the ExampleApp folder. Run pod install before opening the project.

Installation

CocoaPods

Add the following line to your Podfile:

pod 'RxCombine'

Swift Package Manager

Add the following dependency to your Package.swift file:

.package(url: "https://github.com/CombineCommunity/RxCombine.git", from: "1.6.0")

Carthage

Carthage support is offered as a prebuilt binary.

Add the following to your Cartfile:

github "CombineCommunity/RxCombine"

I want to ...

Use RxSwift in my Combine code

RxCombine provides several helpers and conversions to help you bridge your existing RxSwift types to Combine.

Note: If you want to learn more about the parallel operators in Combine from RxSwift, check out my RxSwift to Combine Cheat Sheet (or on GitHub).

Observable (and other ObservableConvertibleTypes) have a publisher property which returns a AnyPublisher<Element, Swift.Error> mirroring the underlying Observable.

let observable = Observable.just("Hello, Combine!")

observable
    .publisher // AnyPublisher<String, Swift.Error>
    .sink(receiveValue: { value in ... })

Relays and Subjects can be converted to their Combine-counterparts using the toCombine() method, so you can use them as if they are regular Combine Subjects, and have them connected to your existing subjects.

let relay = BehaviorRelay<Int>(value: 0)

// Use `sink` on RxSwift relay
let combineSubject = relay.toCombine()

combineSubject.sink(receiveValue: { value in ... })

// Use `send(value:)` on RxSwift relay
combineSubject.send(1)
combineSubject.send(2)
combineSubject.send(3)

Use Combine in my RxSwift code

RxCombine provides several helpers and conversions to help you bridge Combine code and types into your existing RxSwift codebase.

Publishers have a asObservable() method, providing an Observable<Output> mirroring the underlying Publisher.

// A publisher publishing numbers from 0 to 100.
let publisher = AnyPublisher<Int, Swift.Error> { subscriber in
    (0...100).forEach { _ = subscriber.receive($0) }
    subscriber.receive(completion: .finished)
}

publisher
    .asObservable() // Observable<Int>
    .subscribe(onNext: { num in ... })

PassthroughSubject and CurrentValueSubject both have a asAnyObserver() method which returns a AnyObserver<Output>. Binding to it from your RxSwift code pushes the events to the underlying Combine Subject.

// Combine Subject
let subject = PassthroughSubject<Int, Swift.Error>()

// A publisher publishing numbers from 0 to 100.
let publisher = AnyPublisher<Int, Swift.Error> { subscriber in
    (0...100).forEach { _ = subscriber.receive($0) }
    subscriber.receive(completion: .finished)
}

// Convert a Publisher to an Observable and bind it
// back to a Combine Subject 🤯🤯🤯
publisher.asObservable()
         .bind(to: subject)

Observable.of(10, 5, 7, 4, 1,  6)
          .subscribe(subject.asAnyObserver())

Future ideas

~~Add CI / Tests~~
~~Carthage Support~~
Bridge SwiftUI with RxCocoa/RxSwift
~~Partial Backpressure support, perhaps?~~
... your ideas? :)

License

MIT, of course ;-) See the LICENSE file.

The Apple logo and the Combine framework are property of Apple Inc.

travelperk/RxCombine