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.
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
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.
Xcode >= 12.0 or Swift >= 5.3.
For earlier Swifts, Xcodes or for Objective-C support, use PromiseKit 6.
In your Package.swift:
package.dependencies.append(
.package(url: "https://github.com/mxcl/PromiseKit", from: "7.0.0-rc1")
)For more detailed installation instructions or for other package managers see our Installation Guide.
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- Handbook
- Manual
- Installation Guide
- Troubleshooting (e.g., solutions to common compile errors)
- Appendix
- API Reference
Promises are only as useful as the asynchronous tasks they represent. Thus, we
have converted (almost) all of Apple’s APIs to promises. You can use the
extensions by adding the appropriate library to your Package.swift and then
importing it (eg. import PMKFoundation).
See our Installation Guide for usage details.
Browse the Sources folder here for a list of available extensions.
Please check our Troubleshooting Guide, and if after that you still have a question, ask at our Gitter chat channel or on our bug tracker.