class OOViewModel: NSObject {

    struct Input {
        let retry: Int
    }

    struct Output {
        let items: Observable<String>
    }

    func transform(input: Input) -> Output {
        return Output(items: input.request())
    }
}

extension OOViewModel.Input {
    func request() -> Observable<String> {
        var api = NetworkAPIOO.init()
        api.cdy_ip = NetworkConfig.baseURL
        api.cdy_path = "/ip"
        api.cdy_method = APIMethod.get
        api.cdy_plugins = [NetworkLoadingPlugin()]
        api.cdy_retry = self.retry

        return api.cdy_HTTPRequest()
            .asObservable()
            .compactMap{ (($0 as! NSDictionary)["origin"] as? String) }
            .catchAndReturn("")
            .observe(on: MainScheduler.instance)
    }
}

enum LoadingAPI {
    case test2(String)
}

extension LoadingAPI: NetworkAPI {
    var ip: APIHost {
        return NetworkConfig.baseURL
    }

    var path: String {
        return "/post"
    }

    var parameters: APIParameters? {
        switch self {
        case .test2(let string): return ["key": string]
        }
    }
}


class LoadingViewModel: NSObject {
    let disposeBag = DisposeBag()
    let data = PublishRelay<NSDictionary>()

    /// Configure the loading animation plugin
    let APIProvider: MoyaProvider<MultiTarget> = {
        let configuration = URLSessionConfiguration.default
        configuration.headers = .default
        configuration.timeoutIntervalForRequest = 30
        let session = Moya.Session(configuration: configuration, startRequestsImmediately: false)
        let loading = NetworkLoadingPlugin.init()
        return MoyaProvider<MultiTarget>(session: session, plugins: [loading])
    }()

    func loadData() {
        APIProvider.rx.request(api: LoadingAPI.test2("666"))
            .asObservable()
            .subscribe { [weak self] (event) in
                if let dict = event.element as? NSDictionary {
                    self?.data.accept(dict)
                }
            }.disposed(by: disposeBag)
    }
}

class CacheViewModel: NSObject {

    struct Input {
        let count: Int
    }

    struct Output {
        let items: Observable<[CacheModel]>
    }

    func transform(input: Input) -> Output {
        let items = request(input.count).asObservable()

        return Output(items: items)
    }
}

extension CacheViewModel {

    func request(_ count: Int) -> Observable<[CacheModel]> {
        CacheAPI.cache(count).request()
            .mapHandyJSON(HandyDataModel<[CacheModel]>.self)
            .compactMap { $0.data }
            .observe(on: MainScheduler.instance) // the result is returned on the main thread
            .catchAndReturn([]) // return null on error
    }
}

class ChainViewModel: NSObject {
    let disposeBag = DisposeBag()
    let data = PublishRelay<NSDictionary>()

    func chainLoad() {
        requestIP()
            .flatMapLatest(requestData)
            .subscribe(onNext: { [weak self] data in
                self?.data.accept(data)
            }, onError: {
                print("Network Failed: \($0)")
            }).disposed(by: disposeBag)
    }
}

extension ChainViewModel {
    func requestIP() -> Observable<String> {
        return ChainAPI.test.request()
            .asObservable()
            .map { ($0 as! NSDictionary)["origin"] as! String }
            .catchAndReturn("") // Exception thrown
    }

    func requestData(_ ip: String) -> Observable<NSDictionary> {
        return ChainAPI.test2(ip).request()
            .asObservable()
            .map { ($0 as! NSDictionary) }
            .catchAndReturn(["data": "nil"])
    }
}

class BatchViewModel: NSObject {
    let disposeBag = DisposeBag()
    let data = PublishRelay<NSDictionary>()

    /// Configure loading animation plugin
    let APIProvider: MoyaProvider<MultiTarget> = {
        let configuration = URLSessionConfiguration.default
        configuration.headers = .default
        configuration.timeoutIntervalForRequest = 30
        let session = Moya.Session(configuration: configuration, startRequestsImmediately: false)
        let loading = NetworkLoadingPlugin.init()
        return MoyaProvider<MultiTarget>(session: session, plugins: [loading])
    }()

    func batchLoad() {
        Observable.zip(
            APIProvider.rx.request(api: BatchAPI.test).asObservable(),
            APIProvider.rx.request(api: BatchAPI.test2("666")).asObservable(),
            APIProvider.rx.request(api: BatchAPI.test3).asObservable()
        ).subscribe(onNext: { [weak self] in
            guard var data1 = $0 as? Dictionary<String, Any>,
                  let data2 = $1 as? Dictionary<String, Any>,
                  let data3 = $2 as? Dictionary<String, Any> else {
                      return
                  }
            data1 += data2
            data1 += data3
            self?.data.accept(data1)
        }, onError: {
            print("Network Failed: \($0)")
        }).disposed(by: disposeBag)
    }
}

var plugins: APIPlugins {
    let cache = NetworkCachePlugin(cacheType: .networkElseCache)
    let loading = NetworkLoadingPlugin.init(delay: 0.5)
    let warning = NetworkWarningPlugin.init()
    warning.changeHud = { (hud) in
        hud.detailsLabel.textColor = UIColor.yellow
    }
    return [loading, cache, warning]
}

func request(_ count: Int) -> Driver<[CacheModel]> {
    CacheAPI.cache(count).request()
        .asObservable()
        .mapHandyJSON(HandyDataModel<[CacheModel]>.self)
        .compactMap { $0.data }
        .observe(on: MainScheduler.instance)
        .delay(.seconds(1), scheduler: MainScheduler.instance)
        .asDriver(onErrorJustReturn: [])
}

Ex: Import Network Architecture API

- pod 'RxNetworks/MoyaNetwork'

Ex: Import Model Anslysis 

- pod 'RxNetworks/HandyJSON'

Ex: Import loading animation plugin

- pod 'RxNetworks/MoyaPlugins/Loading'