)
Micro Promise/A+ under 100 lines of code. Has all the essential features, adapted for Swift. Covered by Promise/A+ test suite.
Requirements
- iOS 9.0 / watchOS 2.0 / OS X 10.11 / tvOS 9.0
- Xcode 9
- Swift 4
API
Promise/A+
Instead of a single promise.then(onFulfilled, onRejected) method Pill has a bunch of type-safe methods with the same functionality:
Equivalent to onFulfilled:
func then<U>(_ closure: @escaping (T) throws -> U) -> Promise<U>
func then<U>(_ closure: @escaping (T) throws -> Promise<U>) -> Promise<U>Equivalent to onRejected:
func catch(_ closure: @escaping (Error) throws -> Void) -> Promise<T>
func recover(_ closure: @escaping (Error) throws -> T) -> Promise<T>
func recover(_ closure: @escaping (Error) throws -> Promise<T>) -> Promise<T>Each of the then / catch methods also have an on queue: DispatchQueue parameter which is .main by default.
Additions:
func finally(_ closure: @escaping (Void) -> Void) -> Promise<T>Creating Promises
let promise = Promise { fulfill, reject in
doSomething { value, error in
if let value = value {
fulfill(value)
} else {
reject(error)
}
}.resume()
}Already fulfilled:
let promise = Promise(value: 1)Already rejected:
let promise = Promise<Int>(error: Error.unknown)Synchronous Inspection
var isPending: Bool
var value: T?
var error: Error?License
Pill is available under the MIT license. See the LICENSE file for more info.
