Question

当我在订阅之前添加toArray（）时，我没有得到回调。

    googleCalendarUseCase.getEventsFromCalendars(calendars: selectedCalendars).subscribe(onNext: { (event) in
        print(event.summary) //print thousands of elements
    }).addDisposableTo(disposeBag)
    googleCalendarUseCase.getEventsFromCalendars(calendars: selectedCalendars).toArray().subscribe(onNext: { (events) in
        print(events.count)  // Never gets called
    }).addDisposableTo(disposeBag)

问题可能是函数getEventsFromCalendar，但不确定为什么它可以工作如果我不做toArray（）：

func getEventsFromCalendars(calendars: [GoogleCalendar.Calendar], nextPageToken: String? = nil) -> Observable<GoogleCalendar.Event> {
    return Observable<GoogleCalendar.Event>.create { observer -> Disposable in
        var parameters: [String: Any] = [:]
        if let nextPageToken = nextPageToken {
            parameters["pageToken"] = nextPageToken
        }
        _ = self.oauthswift.client.get(GoogleCalendarAPI.events, parameters: parameters, success: { (data, response) in
            if let json = try? JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? [String: AnyObject] {
                if let nextPageToken = self.nextPageToken(json: json) {
                    _ = Observable.of(Observable.from(self.getEventsFromJSON(json: json)), self.getEventsFromCalendars(calendars: calendars, nextPageToken: nextPageToken))
                        .merge().subscribe(observer)
                } else {
                    _ = Observable.from(self.getEventsFromJSON(json: json))
                }
            } else {
                observer.onError(CustomError.other)
            }}, failure: { (error) in  observer.onError(CustomError.noInet) }
        )
        return Disposables.create()
    }
}

Answer 1

使用debug()检查并确保您收到Completed个活动（没有toArray()）。一旦源序列完成，toArray()将仅发出Array。

Answer 2

如果不共享（.share），你只能订阅一次observable 像

let sharedObservable = googleCalendarUseCase.getEventsFromCalendars(calendars: selectedCalendars).share()

    sharedObservable.subscribe(onNext: { (event) in
        print(event.summary)
    }).addDisposableTo(disposeBag)

    sharedObservable.toArray().subscribe(onNext: { (events) in
        print(events.count)
    }).addDisposableTo(disposeBag)

RxSwift toArray（）没有订阅

2 个答案: