Moya


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You're a smart developer. You probably use Alamofire to abstract away access to NSURLSession and all those nasty details you don't really care about. But then, like lots of smart developers, you write ad hoc network abstraction layers. They are probably called "APIManager" or "NetworkModel", and they always end in tears.

Moya Overview

Ad hoc network layers are common in iOS apps. They're bad for a few reasons:

  • Makes it hard to write new apps ("where do I begin?")
  • Makes it hard to maintain existing apps ("oh my god, this mess...")
  • Makes it hard to write unit tests ("how do I do this again?")

So the basic idea of Moya is that we want some network abstraction layer that sufficiently encapsulates actually calling Alamofire directly. It should be simple enough that common things are easy, but comprehensive enough that complicated things are also easy.

If you use Alamofire to abstract away NSURLSession, why not use something to abstract away the nitty gritty of URLs, parameters, etc?

Some awesome features of Moya:

  • Compile-time checking for correct API endpoint accesses.
  • Lets you define a clear usage of different endpoints with associated enum values.
  • Treats test stubs as first-class citizens so unit testing is super-easy.

Sample Project

There's a sample project in the Demo directory. To use it, run pod install to download the required libraries. Have fun!

Project Status

This project is actively under development, and is being used in Artsy's new auction app. We consider it ready for production use.

Currently, we support Xcode 7 and Swift 2.

Installation

Moya version vs Swift version.

Because of the many Swift versions Moya supports, it might be confusing to find the version of Moya that you need. Below is a table that shows which version of Moya you should use for your Swift version.

Swift version Moya version
3.X >= 8.0.0-beta.1
2.3 7.0.2 - 7.0.3
2.2 <= 7.0.1

CocoaPods

For Moya, use the following entry in your Podfile:

pod 'Moya', '8.0.0-beta.4'

In any file you'd like to use Moya in, don't forget to import the framework with import Moya.

For RxSwift or ReactiveCocoa extensions, this project will include them as dependencies. You can do this via CocoaPods subspecs, but you will also need to include the pre-release versions of RxSwift or ReactiveSwift manually.

pod 'Moya/RxSwift'

# or

pod 'Moya/ReactiveCocoa'
pod 'ReactiveSwift', '1.0.0-alpha.3'

Then run pod install.

Carthage

Carthage users can point to this repository and use whichever generated framework they'd like, Moya, RxMoya, or ReactiveMoya. The full Moya framework is bundled in each of those frameworks; importing more than one framework in a single file will result in ambiguous lookups at compile time.

github "Moya/Moya"

Usage

After some setup, using Moya is really simple. You can access an API like this:

provider = MoyaProvider<GitHub>()
provider.request(.zen) { result in
    switch result {
    case let .success(moyaResponse):
        let data = moyaResponse.data
        let statusCode = moyaResponse.statusCode
        // do something with the response data or statusCode
    case let .failure(error):
        // this means there was a network failure - either the request
        // wasn't sent (connectivity), or no response was received (server
        // timed out).  If the server responds with a 4xx or 5xx error, that
        // will be sent as a ".success"-ful response.
    }
}

That's a basic example. Many API requests need parameters. Moya encodes these into the enum you use to access the endpoint, like this:

provider = MoyaProvider<GitHub>()
provider.request(.userProfile("ashfurrow")) { result in
    // do something with the result
}

No more typos in URLs. No more missing parameter values. No more messing with parameter encoding.

For more examples, see the documentation.

Reactive Extensions

Even cooler are the reactive extensions. Moya provides reactive extensions for ReactiveCocoa and RxSwift.

ReactiveCocoa

After ReactiveCocoa setup, request(:) method immediately returns a SignalProducer (RACSignal is also available if needed) that you can start or bind or map or whatever you want to do. To handle errors, for instance, we could do the following:

provider = ReactiveCocoaMoyaProvider<GitHub>()
provider.request(.userProfile("ashfurrow")).start { event in
    switch event {
    case let .value(response):
        image = UIImage(data: response.data)
    case let .failed(error):
        print(error)
    default:
      break
    }
}

RxSwift

After RxSwift setup, request(:) method immediately returns an Observable that you can subscribe to or bind or map or whatever you want to do. To handle errors, for instance, we could do the following:

provider = RxMoyaProvider<GitHub>()
provider.request(.userProfile("ashfurrow")).subscribe { event in
    switch event {
    case let .next(response):
        image = UIImage(data: response.data)
    case let .error(error):
        print(error)
    default:
        break
    }
}

In addition to the option of using signals instead of callback blocks, there are also a series of signal operators for RxSwift and ReactiveCocoa that will attempt to map the data received from the network response into either an image, some JSON, or a string, with mapImage(), mapJSON(), and mapString(), respectively. If the mapping is unsuccessful, you'll get an error on the signal. You also get handy methods for filtering out certain status codes. This means that you can place your code for handling API errors like 400's in the same places as code for handling invalid responses.

Community Extensions

Moya has a great community around it and some people have created some very helpful extensions.

  • Moya-ObjectMapper - ObjectMapper bindings for Moya for easier JSON serialization
  • Moya-SwiftyJSONMapper - SwiftyJSON bindings for Moya for easier JSON serialization
  • Moya-Argo - Argo bindings for Moya for easier JSON serialization
  • Moya-ModelMapper - ModelMapper bindings for Moya for easier JSON serialization
  • Moya-Gloss - Gloss bindings for Moya for easier JSON serialization
  • Moya-JASON - JASON bindings for Moya for easier JSON serialization
  • Moya-Unbox - Unbox bindings for Moya for easier JSON serialization
  • MoyaSugar – Syntactic sugar for Moya

We appreciate all the work being done by the community around Moya. If you would like to have your extension featured in the list above, simply create a pull request adding your extensions to the list.

Contributing

Hey! Like Moya? Awesome! We could actually really use your help!

Open source isn't just writing code. Moya could use your help with any of the following:

  • Finding (and reporting!) bugs.
  • New feature suggestions.
  • Answering questions on issues.
  • Documentation improvements.
  • Reviewing pull requests.
  • Helping to manage issue priorities.
  • Fixing bugs/new features.

If any of that sounds cool to you, send a pull request! After a few contributions, we'll add you as an admin to the repo so you can merge pull requests and help steer the ship ???? You can read more details about that in our contributor guidelines.

Moya's community has a tremendous positive energy, and the maintainers are committed to keeping things awesome. Like in the CocoaPods community, always assume positive intent; even if a comment sounds mean-spirited, give the person the benefit of the doubt.

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

Adding new source files

If you add or remove a source file from Moya, a corresponding change needs to be made to the Moya.xcodeproj project at the root of this repository. This project is used for Carthage. Don't worry, you'll get an automated warning when submitting a pull request if you forget.

License

Moya is released under an MIT license. See LICENSE for more information.

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