rxswfit+mvvm简单实践

extension  where Base: LoadingHUD {
    
    
    var isAnimating: Binder<Bool> {
        return Binder(self.base) { hud, active in
            if active {
                hud.startAnimating()
            } else {
                hud.stopAnimating()
            }
        }
    }
}

func bindData() {
        // 加载状态指示器
        let activityIndicator = ActivityIndicator()
        // 将网络请求取得活动列表数据转化为可观察的序列，之后驱动 tableView 使用
        // 当观察者对 BehaviorSubject 进行订阅时，它会将源 Observable 中最新的元素发送出来（如果不存在最新的元素，就发出默认元素）。然后将随后产生的元素发送出来。
        let activityResponseDriver = BehaviorSubject(value: ())
            .flatMapLatest {
                Networking
                    .rx.requestObject(ActivityResponse.self, url: URL.notifyList)
                    .trackActivity(activityIndicator) // 追踪加载状态
            }
            .asDriver(onErrorJustReturn: ActivityResponse())
        // 驱动HUD
        activityIndicator.asDriver().drive(hud.rx.isAnimating).disposed(by: disposeBag)
        
        // tableView 数据源
        let dataSource = RxTableViewSectionedReloadDataSource<SectionModel<String, Activity>>(
            configureCell: { (_, tv, indexPath, element) in
                let cell = tv.dequeueReusableCell(withIdentifier: ActivityListCell.classIdentifier, for: indexPath) as! ActivityListCell
                cell.activity = element
                return cell
            },
            titleForHeaderInSection: { dataSource, sectionIndex in
                return dataSource[sectionIndex].model
            }
        )
        // 活动列表数据通过 map 转化为一个section数据 再驱动tableView
        activityResponseDriver
            .map { [SectionModel(model: kActivityNotificationStringLocalized, items: $0.data)] }
            .drive(tableView.rx.items(dataSource: dataSource))
            .disposed(by: disposeBag)
        // 活动列表数据 驱动统计view的展示
        activityResponseDriver
            .map { $0.informationNum }
            .drive(onNext: { [unowned self] (informationNum) in
                self.informationNumView.isHidden = informationNum == 0
                self.informationNumView.setTitle("(informationNum)", for: .normal)
            })
            .disposed(by: disposeBag)
        
        tableView.rx.modelSelected(Activity.self)
            .subscribe(onNext: { [unowned self] (activity) in
                if #available(iOS 9.0, *) {
                    let vc = SFSafariViewController(url: url)
                    vc.title = kActivityNotificationStringLocalized
                    self.navigationController?.pushViewController(vc, animated: true)
                } else {
                    let vc = ActivityWebViewController()
                    vc.title = kActivityNotificationStringLocalized
                    vc.url = url
                    self.navigationController?.pushViewController(vc, animated: true)
                }
            })
            .disposed(by: disposeBag)
        
    }

func bindData() {
        
        let pageVariable = Variable(1)
        
        tableView.mj_header = MJRefreshNormalHeader(refreshingBlock: {
            pageVariable.value = 1
        })
        tableView.mj_footer = MJRefreshBackNormalFooter(refreshingBlock: {
            pageVariable.value += 1
        })
        
        let viewModel = OrderInfoListViewModel(pageVariable: pageVariable)
        
        // hud
        viewModel.hudDriver
            .drive(hud.rx.isAnimating)
            .disposed(by: disposeBag)
        
        // tableView dataSource
        viewModel.orderInfoListDriver
            .drive(tableView.rx.items(cellIdentifier: OrderInfoCell.classIdentifier, cellType: OrderInfoCell.self)) { (row, orderInfo, cell) in
                cell.orderInfo = orderInfo
            }
            .disposed(by: disposeBag)
        
        // endRefresh
        viewModel.endHeaderRefreshingDriver
            .drive(tableView.rx.endHeaderRefreshing)
            .disposed(by: disposeBag)
        viewModel.endFooterRefreshingDriver
            .drive(tableView.rx.endFooterRefreshing)
            .disposed(by: disposeBag)
        
        // some UI
        viewModel.orderInfoListDriver
            .skip(1) // skip 跳过第一个元素，emptyView.isHidden
            .map { $0.count > 0 }
            .drive(emptyDataView.rx.isHidden)
            .disposed(by: disposeBag)
        
        // tableView Delegate
        tableView.rx
            .modelSelected(OrderInfo.self)
            .subscribe(onNext:  { [weak self] orderInfo in
                let vc = OrderDetailController()
                vc.tradeNo = orderInfo.tradeNo
                self?.navigationController?.pushViewController(vc, animated: true)
            })
            .disposed(by: disposeBag)
    }
    
}

class OrderInfoListViewModel {
    
    // outputs
    let hudDriver: Driver<Bool>
    let orderInfoListDriver: Driver<[OrderInfo]>
    let endHeaderRefreshingDriver: Driver<Void>
    let endFooterRefreshingDriver: Driver<Int>
    
    init(pageVariable: Variable<Int>) {
        // 元组，包含网络请求状态序列、数据列表序列，刷新信号
        let driversTuple = DataPageable.getDriversTuple(pageVariable: pageVariable, url: URL.consumeRecordQuery, param: ["mobile": UserManager.shared.currentUser!.mobile], type: OrderInfo.self, path: "orderInfo")
        let taskStatusDriver = driversTuple.taskStatusDriver
        orderInfoListDriver = driversTuple.dataListDriver
        endHeaderRefreshingDriver = driversTuple.endHeaderRefreshingDriver
        endFooterRefreshingDriver = driversTuple.endFooterRefreshingDriver
        
        hudDriver = Driver
            .combineLatest(taskStatusDriver, orderInfoListDriver) { $0.isExecuting && $1.isEmpty }
            .distinctUntilChanged()
    }
    
}