ios - RxSwift toArray() 没有订阅

Question

当我在订阅前添加 toArray() 时，我没有收到回调。

    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)

也许问题出在函数 getEventsFromCalendar 上，但不确定如果我不执行 toArray() 为什么它会起作用:

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() 检查并确保您获得了 Completed 事件(没有 toArray())。 toArray() 只会在源序列完成后发出一个 Array。