I have a layered architectured application where I am getting array of objects in ViewModel and binding it with tableview in ViewController. Following is my code: ViewModel:
func getManufacturerList() -> Single<[ManufacturerItem]> {
return self.fetchManufacturerInteractor.getManufacturerList()
.map { $0.map { ManufacturerItem(
manufacturerName: $0.manufacturerName,
manufacturerID: $0.manufacturerID) } }
}
Above function receives array of objects from some other layer which again gets it from NetworkLayer.
ViewController:
private func setUpViewBinding() {
manufacturerViewModel.getManufacturerList()
.asObservable()
.bind(to: tableView.rx.items(cellIdentifier: LanguageSelectionTableViewCell.Identifier,
cellType: LanguageSelectionTableViewCell.self)) { row, manufacturer, cell in
cell.textLabel?.text = manufacturer.manufacturerName
cell.textLabel?.font = AppFonts.appBoldFont(size: 16).value
cell.accessibilityIdentifier = "rowLanguage\(row+1)"
cell.textLabel?.accessibilityIdentifier = tblCellLabelAccessibilityIdentifier
}.disposed(by: self.disposeBag)
}
Now where should I add the code for showing/hiding the activity indicator?
ViewModel should handles showing or hiding IndicatorView (if there is a single loading view) because your view needs to be dumb, use BehaviorRelay instead of variable (variable is depricated)
in viewModel
// create a subject and set the starter state, every time your viewModel
// needs to show or hide a loading, just send an event
let showLoading = BehaviorRelay<Bool>(value: true)
// your async function
func getManufacturerList() -> Observable {
// notify subscriber to show the indicator view
showLoading.accept(true)
// do some works
// notify subscribers to hide the indicator view
showLoading.accept(false)
}
and in your view controller
// bind your indicator view to that subject and wait for events
showLoading.asObservable().observeOn(MainScheduler.instance).bind(to: indicatorView.rx.isHidden).disposed(by: disposeBag)