137 lines
5.7 KiB
Swift
137 lines
5.7 KiB
Swift
//
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// HomeViewController.swift
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// Reader
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//
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// Created by Shadowfacts on 11/25/21.
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//
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import UIKit
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import CoreData
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class HomeViewController: UIViewController, UICollectionViewDelegate {
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let fervorController: FervorController
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private var collectionView: UICollectionView!
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private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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private var groupResultsController: NSFetchedResultsController<Group>!
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private var feedResultsController: NSFetchedResultsController<Feed>!
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init(fervorController: FervorController) {
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self.fervorController = fervorController
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super.init(nibName: nil, bundle: nil)
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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view.backgroundColor = .systemBackground
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// let label = UILabel()
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// label.translatesAutoresizingMaskIntoConstraints = false
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// label.text = "Logged in to \(fervorController.instanceURL.host!)"
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// view.addSubview(label)
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// NSLayoutConstraint.activate([
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// label.centerXAnchor.constraint(equalTo: view.centerXAnchor),
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// label.centerYAnchor.constraint(equalTo: view.centerYAnchor),
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// ])
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let configuration = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
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let layout = UICollectionViewCompositionalLayout.list(using: configuration)
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collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
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collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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collectionView.delegate = self
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view.addSubview(collectionView)
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dataSource = createDataSource()
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// todo: maybe NSFetchedResultsController to automatically update when the database changes?
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// applyInitialSnapshot()
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.groups, .feeds])
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dataSource.apply(snapshot, animatingDifferences: false)
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let groupReq = Group.fetchRequest()
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groupReq.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
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groupResultsController = NSFetchedResultsController(fetchRequest: groupReq, managedObjectContext: fervorController.persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil)
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groupResultsController.delegate = self
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try! groupResultsController.performFetch()
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let feedReq = Feed.fetchRequest()
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feedReq.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
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feedResultsController = NSFetchedResultsController(fetchRequest: feedReq, managedObjectContext: fervorController.persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil)
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feedResultsController.delegate = self
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try! feedResultsController.performFetch()
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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let listCell = UICollectionView.CellRegistration<UICollectionViewListCell, Item> { cell, indexPath, item in
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var config = cell.defaultContentConfiguration()
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config.text = item.title
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cell.contentConfiguration = config
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cell.accessories = [.disclosureIndicator()]
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}
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let dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: collectionView) { collectionView, indexPath, item in
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return collectionView.dequeueConfiguredReusableCell(using: listCell, for: indexPath, item: item)
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}
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return dataSource
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}
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// private func applyInitialSnapshot() {
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// let groups = try! fervorController.persistentContainer.viewContext.fetch(Group.fetchRequest())
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// let feeds = try! fervorController.persistentContainer.viewContext.fetch(Feed.fetchRequest())
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//
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// var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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// snapshot.appendSections([.groups, .feeds])
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// snapshot.appendItems(groups.map { .group($0) }, toSection: .groups)
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// snapshot.appendItems(feeds.map { .feed($0) }, toSection: .feeds)
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// dataSource.apply(snapshot, animatingDifferences: false)
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// }
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}
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extension HomeViewController {
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enum Section: Hashable {
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case groups
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case feeds
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}
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enum Item: Hashable {
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case group(Group)
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case feed(Feed)
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var title: String {
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switch self {
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case let .group(group):
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// todo: manual codegen for models so this force unwrap isn't necessary
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return group.title!
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case let .feed(feed):
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return feed.title!
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}
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}
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}
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}
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extension HomeViewController: NSFetchedResultsControllerDelegate {
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func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshotReference) {
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var snapshot = dataSource.snapshot()
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if controller == groupResultsController {
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if snapshot.sectionIdentifiers.contains(.groups) {
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snapshot.deleteItems(snapshot.itemIdentifiers(inSection: .groups))
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}
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snapshot.appendItems(controller.fetchedObjects!.map { .group($0 as! Group) }, toSection: .groups)
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} else if controller == feedResultsController {
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if snapshot.sectionIdentifiers.contains(.feeds) {
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snapshot.deleteItems(snapshot.itemIdentifiers(inSection: .feeds))
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}
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snapshot.appendItems(controller.fetchedObjects!.map { .feed($0 as! Feed) }, toSection: .feeds)
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}
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dataSource.apply(snapshot, animatingDifferences: false)
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}
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}
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