PromiseKit Photos Extensions 
This project adds promises to Apple’s Photos framework.
CocoaPods
pod "PromiseKit/Photos", "~> 6.0"
The extensions are built into PromiseKit.framework thus nothing else is needed.
Carthage
github "PromiseKit/Photos" ~> 3.0
The extensions are built into their own framework:
// swift
import PromiseKit
import PMKPhotos
// objc
@import PromiseKit;
@import PMKPhotos;