ios - RxSwift 从一个 Observable 创建多个 Observable

Question

如何共享一个 API 调用？例如，我有以下模型类。这些属性将绑定(bind)到不同的 UI 组件。我正在 ViewController 中实现这个。但是，我认为我不应该将模型暴露给 View 层。相反，我应该为 ViewController 提供两个要绑定(bind)的 Observable 属性。一个用于 UITextField，另一个用于 UITableView。那么，我应该如何从一个 Observable 创建多个 Observable 呢？

struct CustomerListJSON : Codable {
    var UserCount:Int?
    var TotalReward:Int?
    var CurMonthUserCount:Int?
    var CurMonthTotalReward:Int?
    var CurYearUserCount:Int?
    var CurYearTotalReward:Int?
    var UserList:[CustomerJSON]?
}

let getSummery = self.viewModel.getSummery()

getSummery.flatMap{ [weak self](summery) ->  Observable<[CustomerJSON]> in

//Label datesource
            self?.summeryLabel.text = " \(summery.UserCount ?? 0)\t \(summery.TotalReward ?? 0)\n \(summery.CurMonthUserCount ?? 0)\t \(summery.CurMonthTotalReward ?? 0)\n \(summery.CurYearUserCount ?? 0)\t\(summery.CurYearTotalReward ?? 0)"

            return Observable.of(summery.UserList ?? [])
//Table datasource
        }.bind(to: self.tableView.rx.items(cellIdentifier: "customerCell", cellType: UITableViewCell.self)){ (index, customer, cell) in
            cell.textLabel?.text = "\(customer.UserName ?? "")\t\t\(customer.CreateTime ?? "")"
        }.disposed(by: rx.disposeBag)

Answer 1

我有一个像这样的不成熟的解决方案。因此，我可以将这两个 Observable 绑定(bind)到 ViewController 中的 UI，以隐藏 Model 结构。

但是，API 调用无法共享。这是另一个问题了~

    fileprivate func apiCall() -> Observable<Response> {
                let userID = UserModel.sharedInstance.uID

                return self.dateParameterTrigger
                    .observeOn(self.queue)
                    .flatMap{ para -> Observable<Response> in
                        let startDateStr = para.0
                        let endDateStr = para.1
                        return self.provider.rx.request(CustomerTarget.GetInvitedUserList(userID, 0, 20, startDateStr, endDateStr))
                               .asObservable()
                               .share(replay: 1, scope: SubjectLifetimeScope.forever)
                    }

            }

            func getSummery() -> Observable<CustomerListJSON> {

                return apiCall()
                    .flatMap{ event -> Observable<CustomerListJSON> in
                        let catchReturn = Observable.of(CustomerListJSON())
                        var baseModel:CustomerModel!

                            do{
                                let decoder = JSONDecoder()
                                baseModel = try decoder.decode(CustomerModel.self, from: event.data)
                            }catch let error {
                                print( error )
                                return catchReturn
                            }

                            guard let model = baseModel, let customerModel = model.returnValue else {
                                return catchReturn
                            }

                            return Observable.just(customerModel)
                }
            }

            func getCustomerList() -> Observable<[CustomerJSON]> {

                return self.apiCall()
                    .flatMap{ event -> Observable<[CustomerJSON]> in
                        let catchReturn = Observable.of([CustomerJSON]())
                        var baseModel:CustomerModel!
                        do{
                            let decoder = JSONDecoder()
                            baseModel = try decoder.decode(CustomerModel.self, from: event.data)
                        }catch let error {
                            print( error )
                            return catchReturn
                        }

                        guard let model = baseModel, let customerModel = model.returnValue, let customerList = customerModel.UserList else {
                            return catchReturn
                        }

                        return Observable.just(customerList)
                }
            }