Javier Cicchelli
c8d2c288af
This PR contains the work done to fetch a set of locations from a remote server to then persist them into the persistence stack and finally to display these data into the locations list screen. To give further details about the work done: - [x] implemented the `LoadingSpinnerView` and `ErrorMessageView` custom views; - [x] implemented the outlets of the `LocationsListViewController` view controller; - [x] add properties and functions to the `LocationsListViewModeling` protocol to support reactive updates, load data, and table data source conformances; - [x] deactivated the Location entity code generation from the Core Data model in the `Persistence` library; - [x] add fetch requests builder functions to the `NSFetchRequest+Location` extension in the `Persistence` library; - [x] implemented the `LoadRemoteLocationUseCase` use case; - [x] implemented the loading of locations in the LocationsListViewModel view model; - [x] implemented properties and functions in the LocationsListViewModel view model to support the table data source conformance of the `LocationsListViewController` view controller; - [x] implemented the `LocationViewCell` custom cell; - [x] registered the `LocationViewCell` with the table of the `LocationsListViewController` view controller and implemented its update with real data from Location entities. Co-authored-by: Javier Cicchelli <javier@rock-n-code.com> Reviewed-on: rock-n-code/deep-linking-assignment#10
100 lines
2.3 KiB
Swift
100 lines
2.3 KiB
Swift
//
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// LocationsListViewModel.swift
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// Locations
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//
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// Created by Javier Cicchelli on 11/04/2023.
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// Copyright © 2023 Röck+Cöde. All rights reserved.
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//
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import CoreData
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import Combine
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import Dependency
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import Foundation
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import Persistence
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class LocationsListViewModel: ObservableObject {
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// MARK: Dependencies
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@Dependency(\.persistence) private var persistence
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// MARK: Properties
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weak var coordinator: LocationsListCoordination?
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@Published private var viewStatus: LocationsListViewStatus = .initialised
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private lazy var fetchedResultsController = NSFetchedResultsController(
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fetchRequest: NSFetchRequest<Location>.allLocations(),
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managedObjectContext: persistence.container.viewContext,
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sectionNameKeyPath: nil,
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cacheName: nil
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)
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private let loadRemoteLocations = LoadRemoteLocationsUseCase()
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// MARK: Initialisers
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init(coordinator: LocationsListCoordination) {
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self.coordinator = coordinator
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}
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}
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// MARK: - LocationsListViewModeling
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extension LocationsListViewModel: LocationsListViewModeling {
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// MARK: Properties
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var viewStatusPublisher: Published<LocationsListViewStatus>.Publisher { $viewStatus }
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var numberOfSectionsInData: Int { fetchedResultsController.sections?.count ?? 0 }
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// MARK: Functions
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func openAddLocation() {
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coordinator?.openAddLocation()
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}
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func loadLocations() {
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Task {
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do {
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viewStatus = .loading
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try await loadRemoteLocations()
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try fetchedResultsController.performFetch()
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viewStatus = .loaded
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} catch {
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viewStatus = .error
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}
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}
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}
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func numberOfDataItems(in section: Int) -> Int {
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guard
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let sections = fetchedResultsController.sections,
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sections.endIndex > section
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else {
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return 0
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}
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return sections[section].numberOfObjects
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}
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func dataItem(at indexPath: IndexPath) -> Location {
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fetchedResultsController.object(at: indexPath)
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}
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}
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// MARK: - Enumerations
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enum LocationsListViewStatus {
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case initialised
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case loading
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case loaded
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case error
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}
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