ncreated

import UIKit
import RxCocoa
import RxSwift

class SettingsViewController: UIViewController {

    @IBOutlet weak var settingSwitch1: UISwitch!
    @IBOutlet weak var settingSwitch2: UISwitch!
    @IBOutlet weak var settingSwitch3: UISwitch!
    @IBOutlet weak var settingSwitch4: UISwitch!

ncreated

func manage(change: Observable<Bool>) -> (value: Driver<ToggleValue>, isBusy: Driver<Bool>) {
    let storage = self.storage
    let isBusySubject = PublishSubject<Bool>()

    let isBusy = isBusySubject
        .asDriver(onErrorJustReturn: false)
        .startWith(true)

    let initialValue = storage
        .read()

ncreated

func manage(change: Observable<Bool>) -> (value: Driver<ToggleValue>, isBusy: Driver<Bool>) {
    let storage = self.storage

    let initialValue = storage
        .read()
        .map { ToggleValue.initial($0) }
        .catchError { Observable.just( ToggleValue.unknown($0) ) }

    let valueAfterSaving = change
        .flatMap { valueToSave -> Observable<ToggleValue> in

ncreated

func manage(change: Observable<Bool>) -> (value: Driver<ToggleValue>, isBusy: Driver<Bool>) {
    // ...
  
    let storage = self.storage
  
    let valueAfterSaving = change
        .flatMap { valueToSave -> Observable<ToggleValue> in
            storage
                .save(value: valueToSave)
                .map { ToggleValue.updated(valueToSave) }

ncreated

func manage(change: Observable<Bool>) -> (value: Driver<ToggleValue>, isBusy: Driver<Bool>) {
    // ...

    let initialValue = storage
        .read()
        .map { ToggleValue.initial($0) }
        .catchError { Observable.just( ToggleValue.unknown($0) ) }

    // ...
}

ncreated

enum ToggleValue {

    /// Initial value read from storage
    case initial(Bool)

    /// Updated value after successfully saving in storage
    case updated(Bool)

    /// Fallback value after unsuccessfully saving in storage
    case fallback(Bool)

ncreated

import RxSwift
import RxCocoa

final class Toggle {

    // MARK: - Properties

    private let storage: ToggleStorage

    // MARK: - Initializer

ncreated

import RxSwift

final class NetworkToggleStorage: ToggleStorage {

    // MARK: - Properties

    private var value: Bool

    // MARK: - Initializers

ncreated

import RxSwift

protocol ToggleStorage {

    func read() -> Observable<Bool>
    func save(value: Bool) -> Observable<Void>
}

ncreated

import RxSwift
import RxCocoa

final class Toggle {

    func manage(change: Observable<Bool>) -> (value: Driver<ToggleValue>,
                                              isBusy: Driver<Bool>) {
        return (value: .empty(), isBusy: .empty()) // TODO
    }
}