IGListKit/Examples/Examples-iOS/IGListKitTodayExample/TodayViewController.swift

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

import IGListDiffKit
import IGListKit
import NotificationCenter
import UIKit

@available(iOSApplicationExtension 10.0, *)
final class TodayViewController: UIViewController, NCWidgetProviding, ListAdapterDataSource {

    lazy var adapter: ListAdapter = {
        return ListAdapter(updater: ListAdapterUpdater(), viewController: self)
    }()
    let collectionView = UICollectionView(frame: CGRect.zero, collectionViewLayout: UICollectionViewFlowLayout())

    let data = "Maecenas faucibus mollis interdum. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.".components(separatedBy: " ")

    override func viewDidLoad() {
        super.viewDidLoad()

        adapter.collectionView = collectionView
        adapter.dataSource = self

        view.addSubview(collectionView)

        // Enables the 'Show More' button in the widget interface
        extensionContext?.widgetLargestAvailableDisplayMode = .expanded
    }

    override func loadView() {
        view = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 110))
    }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        collectionView.frame = view.bounds
    }

    // MARK: NCWidgetProviding

    func widgetActiveDisplayModeDidChange(_ activeDisplayMode: NCWidgetDisplayMode, withMaximumSize maxSize: CGSize) {
        preferredContentSize = maxSize
    }

    // MARK: ListAdapterDataSource

    func objects(for listAdapter: ListAdapter) -> [ListDiffable] {
        return data as [ListDiffable]
    }

    func listAdapter(_ listAdapter: ListAdapter, sectionControllerFor object: Any) -> ListSectionController {
        return LabelSectionController()
    }

    func emptyView(for listAdapter: ListAdapter) -> UIView? {
        return nil
    }
}