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https://github.com/mxcl/PromiseKit

Promises for Swift & ObjC.
https://github.com/mxcl/PromiseKit

objc promises swift

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Promises for Swift & ObjC.

Lists

README 

        
![PromiseKit](../gh-pages/public/img/logo-tight.png)



[![badge-pod][]][cocoapods] ![badge-languages][] ![badge-pms][] ![badge-platforms][] [![codecov](https://codecov.io/gh/mxcl/PromiseKit/branch/master/graph/badge.svg?token=wHSAz7N8WA)](https://codecov.io/gh/mxcl/PromiseKit)



---



Promises simplify asynchronous programming, freeing you up to focus on the more

important things. They are easy to learn, easy to master and result in clearer,

more readable code. Your co-workers will thank you.



```swift

UIApplication.shared.isNetworkActivityIndicatorVisible = true



let fetchImage = URLSession.shared.dataTask(.promise, with: url).compactMap{ UIImage(data: $0.data) }

let fetchLocation = CLLocationManager.requestLocation().lastValue



firstly {

    when(fulfilled: fetchImage, fetchLocation)

}.done { image, location in

    self.imageView.image = image

    self.label.text = "\(location)"

}.ensure {

    UIApplication.shared.isNetworkActivityIndicatorVisible = false

}.catch { error in

    self.show(UIAlertController(for: error), sender: self)

}

```



PromiseKit is a thoughtful and complete implementation of promises for any

platform that has a `swiftc`. It has *excellent* Objective-C bridging and

*delightful* specializations for iOS, macOS, tvOS and watchOS. It is a top-100

pod used in many of the most popular apps in the world.



[![codecov](https://codecov.io/gh/mxcl/PromiseKit/branch/master/graph/badge.svg)](https://codecov.io/gh/mxcl/PromiseKit)



# Quick Start



In your [Podfile]:



```ruby

use_frameworks!



target "Change Me!" do

  pod "PromiseKit", "~> 8"

end

```



PromiseKit 8 supports recent Xcodes (13+). Some Podspecs were

[dropped as a result](https://github.com/mxcl/PromiseKit/pull/1318).

Pull requests are welcome.



PromiseKit 6, 5 and 4 support Xcode 8.3, 9.x and 10.0; Swift 3.1,

3.2, 3.3, 3.4, 4.0, 4.1, 4.2, 4.3 and 5.0 (development snapshots); iOS, macOS,

tvOS, watchOS, Linux and Android; CocoaPods, Carthage and SwiftPM;

([CI Matrix](https://travis-ci.org/mxcl/PromiseKit)).



For Carthage, SwiftPM, Accio, etc., or for instructions when using older Swifts or Xcodes, see our [Installation Guide]. We recommend

[Carthage](https://github.com/Carthage/Carthage) or

[Accio](https://github.com/JamitLabs/Accio).



# PromiseKit and Swift 5.5+ Async/Await



As of Swift 5.5, the Swift language now offers support for [built-in concurrency with async / await](https://docs.swift.org/swift-book/LanguageGuide/Concurrency.html).  See [Async+](https://github.com/async-plus/async-plus) for a port of PromiseKit's most useful patterns to this new paradigm.



# Professionally Supported PromiseKit is Now Available



TideLift gives software development teams a single source for purchasing

and maintaining their software, with professional grade assurances from

the experts who know it best, while seamlessly integrating with existing

tools.



[Get Professional Support for PromiseKit with TideLift](https://tidelift.com/subscription/pkg/cocoapods-promisekit?utm_source=cocoapods-promisekit&utm_medium=referral&utm_campaign=readme).



# Documentation



* Handbook

  * [Getting Started](Documentation/GettingStarted.md)

  * [Promises: Common Patterns](Documentation/CommonPatterns.md)

  * [Frequently Asked Questions](Documentation/FAQ.md)

* Manual

  * [Installation Guide](Documentation/Installation.md)

  * [Objective-C Guide](Documentation/ObjectiveC.md)

  * [Troubleshooting](Documentation/Troubleshooting.md) (e.g., solutions to common compile errors)

  * [Appendix](Documentation/Appendix.md)

* [API Reference](https://mxcl.dev/PromiseKit/reference/v6/Classes/Promise.html)



# Extensions



Promises are only as useful as the asynchronous tasks they represent. Thus, we

have converted (almost) all of Apple’s APIs to promises. The default CocoaPod

provides Promises and the extensions for Foundation and UIKit. The other

extensions are available by specifying additional subspecs in your `Podfile`,

e.g.:



```ruby

pod "PromiseKit/MapKit"          # MKDirections().calculate().then { /*…*/ }

pod "PromiseKit/CoreLocation"    # CLLocationManager.requestLocation().then { /*…*/ }

```



All our extensions are separate repositories at the [PromiseKit organization].



## I don't want the extensions!



Then don’t have them:



```ruby

pod "PromiseKit/CorePromise", "~> 8"

```



> *Note:* Carthage installations come with no extensions by default.



## Networking



Promise chains commonly start with a network operation. Thus, we offer

extensions for `URLSession`:



```swift

// pod 'PromiseKit/Foundation'  # https://github.com/PromiseKit/Foundation



firstly {

    URLSession.shared.dataTask(.promise, with: try makeUrlRequest()).validate()

    // ^^ we provide `.validate()` so that eg. 404s get converted to errors

}.map {

    try JSONDecoder().decode(Foo.self, with: $0.data)

}.done { foo in

    //…

}.catch { error in

    //…

}



func makeUrlRequest() throws -> URLRequest {

    var rq = URLRequest(url: url)

    rq.httpMethod = "POST"

    rq.addValue("application/json", forHTTPHeaderField: "Content-Type")

    rq.addValue("application/json", forHTTPHeaderField: "Accept")

    rq.httpBody = try JSONEncoder().encode(obj)

    return rq

}

```



Support for Alamofire is welcome, please submit a PR.



# Support



Please check our [Troubleshooting Guide](Documentation/Troubleshooting.md), and

if after that you still have a question, ask at our [Gitter chat channel] or on [our bug tracker].



## Security & Vulnerability Reporting or Disclosure



https://tidelift.com/security



[badge-pod]: https://img.shields.io/cocoapods/v/PromiseKit.svg?label=version

[badge-pms]: https://img.shields.io/badge/supports-CocoaPods%20%7C%20Carthage%20%7C%20Accio%20%7C%20SwiftPM-green.svg

[badge-languages]: https://img.shields.io/badge/languages-Swift%20%7C%20ObjC-orange.svg

[badge-platforms]: https://img.shields.io/badge/platforms-macOS%20%7C%20iOS%20%7C%20watchOS%20%7C%20tvOS%20%7C%20Linux-lightgrey.svg

[badge-mit]: https://img.shields.io/badge/license-MIT-blue.svg

[OMGHTTPURLRQ]: https://github.com/PromiseKit/OMGHTTPURLRQ

[Alamofire]: http://github.com/PromiseKit/Alamofire-

[PromiseKit organization]: https://github.com/PromiseKit

[Gitter chat channel]: https://gitter.im/mxcl/PromiseKit

[our bug tracker]: https://github.com/mxcl/PromiseKit/issues/new

[Podfile]: https://guides.cocoapods.org/syntax/podfile.html

[PMK6]: http://mxcl.dev/PromiseKit/news/2018/02/PromiseKit-6.0-Released/

[Installation Guide]: Documentation/Installation.md

[badge-travis]: https://travis-ci.org/mxcl/PromiseKit.svg?branch=master

[travis]: https://travis-ci.org/mxcl/PromiseKit

[cocoapods]: https://cocoapods.org/pods/PromiseKit