无法使用 Future COMBINE iOS Swift 传递数据

Question

我正在使用 Alamofire 进行数据下载和使用 Future Publisher 传递数据，在另一个 class 中，我正在访问该数据并解码 JsonData 并再次使用另一个 future 传递它。 但有时我在 UI 中成功显示，有时它不起作用。

扩展 HTTPManager: NetworkManager {

fun getData(from urlString: String) -> Future<Data, Error> {
    return Future { promise in
        AF.request(urlString).response { responseData in
            switch responseData.result {
            case .failure(let error):
                promise(.failure(error))
            case .success(let data):
                guard let data = data else { return }
                promise(.success(data))
            }
        }
    }
}

}

fun fetchDetailData() -> Future<[DetailViewModel], Error> {
    return Future { [self] promise in
        let resultData = self.networkManager.getData(from: self.urlString)
            .subscribe(on: DispatchQueue.global(qos: .background))
        resultData.sink { (completion) in
            switch completion {
            case .failure(let error):
                promise(.failure(error))
            case .finished:
                debugPrint("api call successful")
            }
        } receiveValue: { (data) in
            do {
                let detailData = try JSONDecoder().decode([Detail].self, from: data)
                let detailsData = detailData.map {
                    DetailViewModel(with: $0)
                }
                promise(.success(detailsData))
            }
            catch let jsonError {
                promise(.failure(jsonError))
            }
        }.store(in: &subscriptions)
    }
}


fun fetchDetailsData() {
    self.subscriber = DetailServiceManager().fetchDetailData()
        .receive(on: DispatchQueue.main)
        .sink { completion in
            switch completion {
            case .failure(let error):
                debugPrint("Error Occured", error)
            case .finished:
                debugPrint("Api call is successful")
            }
        } receiveValue: { detailData in
            DispatchQueue.main.async {
                self.detailsData = detailData
            }
        }
}