ReactiveExtension to create a bidirectional binding with a CosmosView rating control

ReactiveExtensionsCosmos.swift

//
//  ReactiveExtensionsCosmos.swift
//  Route.nl
//
//  Created by Pim Nijman on 07/09/2019.
//  Copyright © 2019 Falk. All rights reserved.
//

import Bond
import ReactiveKit
import Cosmos // https://github.com/evgenyneu/Cosmos

extension ReactiveExtensions where Base: CosmosView {
	
	public var rating: DynamicSubject<Double> {
		return dynamicSubject(
			signal: didTouchCosmosSignal,
			get: { $0.rating },
			set: { $0.rating = $1 }
		)
	}
	
	public var didTouchCosmosSignal: SafeSignal<Void> {
		let base = self.base
		return Signal { [weak base] observer in
			guard let base = base else {
				observer.completed()
				return NonDisposable.instance
			}
			base.didTouchCosmos = { _ in
				observer.next(())
			}
			return BlockDisposable {
				base.didTouchCosmos = nil
			}
		}.take(until: base.deallocated)
	}
	
}