PromiseKit UIKit Extensions 
This project adds promises to Apple’s UIKit framework.
This project supports Swift 3.0, 3.1, 3.2 and 4.0; iOS 9, 10 and 11; tvOS 10 and 11; CocoaPods and Carthage; Xcode 8.0, 8.1, 8.2, 8.3 and 9.0.
CocoaPods
pod "PromiseKit/UIKit", "~> 6.0"
The extensions are built into PromiseKit.framework thus import PromiseKit is
all that is needed.
Carthage
github "PromiseKit/UIKit" ~> 3.0
The extensions are built into their own framework:
// swift
import PromiseKit
import PMKUIKit
// objc
@import PromiseKit;
@import PMKUIKit;
UIImagePickerController
Due to iOS 10 requiring an entry in your app’s Info.plist for any usage of UIImagePickerController (even if you don’t actually call it directly), we have removed UIImagePickerController from the default UIKit pod. To use it you must add an additional subspec:
pod "PromiseKit/UIImagePickerController"
Sorry, but there’s not an easier way.