Question

以下代码有效：

td item

在上面的代码中调用onCompleted方法但不在下面的代码中。

我正在尝试使用UITableView中的刷新触发器来刷新内容。我想在开始时加载内容，所以我在ViewModel的以下代码中使用let provider = RxMoyaProvider<MyAPI>( stubClosure: MoyaProvider.delayedStub(3)) provider .request(.studentSearch(query: "")) .retry(3) .observeOn(MainScheduler.instance) .asObservable() .mapJSON() .map { respJSON in guard let studentsJsonArray = JSON(respJSON)["students"].array else { throw APIError.wrongJSONParsing } return studentsJsonArray.map { guard let students = Student.fromJSON($0) else { fatalError("Invalid Student Object") } return students } as [Student] } .subscribe(onNext: { print($0) }, onCompleted: { print($0) // This one is being called. }) .disposed(by: rx.disposeBag)

startWith(())

在控制器中我在viewdidload中调用以下内容。

let results: Driver<[Student]>
var refreshTrigger = PublishSubject<Void>()
results = refreshTrigger
        .startWith(())
        .do(onNext: {
            execute.value = true
        })
        .flatMapLatest {
            provider
                .request(.studentSearch(query: ""))
                .retry(3)
                .observeOn(MainScheduler.instance)
                .asObservable()
        }
        .mapJSON()
        .map { respJSON in
            guard let studentsJsonArray = JSON(respJSON)["students"].array else {
                throw APIError.wrongJSONParsing
            }
            return studentsJsonArray.map {
                guard let students = Student.fromJSON($0) else {
                    fatalError("Invalid Student Object")
                }
                return students
            }
        }
        .do(onNext: {
            items.value = $0
            execute.value = false
            noResults.value = items.value.isEmpty
        }, onCompleted: {
            print($0)
        })
        .asDriver(onErrorJustReturn: [])

此处onCompleted未被调用。我不知道原因是什么？请帮帮我。

Answer 1

flatMapLatest不会发送onCompleted事件，除非它的输入（在你的情况下是PublishSubject）完成。 Moya请求发送它们自己的onCompleted事件，但是当flatMapLatest合并结果时，这些事件会被过滤掉。换句话说，从PublishSubject到数据源的长期订阅没有完成，也不应该。（编辑）的（否则在第一次加载后你将失去刷新功能。）

我从RxSwift Slack频道获得Zsolt Varadi的帮助。

这是解决方案

results = refreshTrigger
        .startWith(())
        .do(onNext: {
            execute.value = true
        })
        .flatMapLatest {
            provider
                .request(.studentSearch(query: ""))
                .retry(3)
                .observeOn(MainScheduler.instance)
                .asObservable()
                .mapJSON()
                .map { respJSON in
                    guard let studentsJsonArray = JSON(respJSON)["students"].array else {
                        throw APIError.wrongJSONParsing
                    }
                    return studentsJsonArray.map {
                        guard let students = Student.fromJSON($0) else {
                            fatalError("Invalid Student Object")
                        }
                        return students
                        } as [Student]
                }
                .map { StudentGroup(header: "Follower", items: $0) }
                .toArray()
                .catchErrorJustReturn([])
                .do(onNext: {
                    studentGroups.value = $0
                    execute.value = false
                    guard let isEmpty = studentGroups.value.first?.items.isEmpty else {
                        return
                    }
                    noResults.value = isEmpty
                })
        }
        .asDriver(onErrorJustReturn: [])

没有使用RxMoya在RxSwift上获得完成事件

1 个答案: