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EventsViewModel.swift (https://github.com/takuwan0405/RxSwiftSample)
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import RxSwift | |
import UIKit | |
/** | |
EventsViewControllerの状態を扱うViewModel | |
- eventModel: Eventに関するデータを扱うモデル | |
- scheduler: RxSwiftで非同期通信を行うためのシングルトン | |
- disposeBag: RxSwiftで不要なstreamを削除するためのクラス | |
- events: Event一覧を格納 | |
- viewState: Viewの状態を表現 | |
- scrollEndComing: tableViewのスクロールが終わりかけているかを判定した結果 | |
*/ | |
struct EventsViewModel { | |
private let eventModel = EventsModel() | |
private let scheduler = RxScheduler.sharedInstance | |
private let disposeBag = DisposeBag() | |
internal let events: Variable<[EventListResponse.Events]> = Variable([]) | |
internal let viewState = Variable(ViewState.Blank) | |
internal let scrollEndComing = Variable(false) | |
init() { | |
scrollEndComing | |
.asObservable() | |
.subscribeNext { scrollEndComing in | |
if self.viewState.value.fetchEnabled() && scrollEndComing { | |
self.eventModel.fetchEventList( self.nextEventsCount() ) | |
} | |
} | |
.addDisposableTo(disposeBag) | |
/** | |
APIの結果をsubscribeしている | |
*/ | |
eventModel | |
.requestState | |
.asObservable() | |
.subscribeOn(scheduler.serialBackground) | |
.observeOn(scheduler.main) | |
.subscribeNext { | |
self.subscribeState($0) | |
} | |
.addDisposableTo(disposeBag) | |
} | |
/** | |
APIの通信状況とViewの状態を接続している | |
*/ | |
func subscribeState(state: RequestState) { | |
switch state { | |
case .Stopped: | |
self.viewState.value = .Blank | |
case .Requesting: | |
self.viewState.value = .Requesting | |
case .Error(let error): | |
self.viewState.value = .Error(error) | |
case .Response(let response): | |
let events = (response as? EventListResponse)?.events ?? [] | |
self.viewState.value = .Working | |
self.scrollEndComing.value = false | |
self.events.value += events | |
} | |
} | |
/** | |
ATND APIで、未取得のイベントを取ってくるために、これまでに取得したイベント数 + 1をを指定 | |
*/ | |
func nextEventsCount() -> Int { | |
return self.events.value.count + 1 | |
} | |
} |
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