mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-04 14:09:28 +00:00
f92b9339ee
Summary: The standardized Meta copyright notice is "Copyright (c) Meta Platforms, Inc. and affiliates." and not "Copyright (c) Meta Platforms, Inc. and its affiliates." (Dropping the "its") This diff updates the copyright notice in each source file to the correct this. Reviewed By: willbailey Differential Revision: D44737667 fbshipit-source-id: 643bf36df76723e70d9d826c53cf8f29b8a0c8cc
80 lines
2.6 KiB
Swift
80 lines
2.6 KiB
Swift
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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import IGListKit
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import UIKit
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final class LoadMoreViewController: UIViewController, ListAdapterDataSource, UIScrollViewDelegate {
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lazy var adapter: ListAdapter = {
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return ListAdapter(updater: ListAdapterUpdater(), viewController: self)
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}()
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let collectionView = UICollectionView(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())
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lazy var items = Array(0...20)
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var loading = false
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let spinToken = "spinner"
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override func viewDidLoad() {
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super.viewDidLoad()
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view.addSubview(collectionView)
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adapter.collectionView = collectionView
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adapter.dataSource = self
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adapter.scrollViewDelegate = self
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}
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override func viewDidLayoutSubviews() {
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super.viewDidLayoutSubviews()
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collectionView.frame = view.bounds
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}
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// MARK: ListAdapterDataSource
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func objects(for listAdapter: ListAdapter) -> [ListDiffable] {
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var objects = items as [ListDiffable]
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if loading {
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objects.append(spinToken as ListDiffable)
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}
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return objects
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}
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func listAdapter(_ listAdapter: ListAdapter, sectionControllerFor object: Any) -> ListSectionController {
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if let obj = object as? String, obj == spinToken {
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return spinnerSectionController()
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} else {
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return LabelSectionController()
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}
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}
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func emptyView(for listAdapter: ListAdapter) -> UIView? { return nil }
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// MARK: UIScrollViewDelegate
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func scrollViewWillEndDragging(_ scrollView: UIScrollView,
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withVelocity velocity: CGPoint,
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targetContentOffset: UnsafeMutablePointer<CGPoint>) {
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let distance = scrollView.contentSize.height - (targetContentOffset.pointee.y + scrollView.bounds.height)
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if !loading && distance < 200 {
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loading = true
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adapter.performUpdates(animated: true, completion: nil)
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DispatchQueue.global(qos: .default).async {
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// fake background loading task
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sleep(2)
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DispatchQueue.main.async {
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self.loading = false
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let itemCount = self.items.count
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self.items.append(contentsOf: Array(itemCount..<itemCount + 5))
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self.adapter.performUpdates(animated: true, completion: nil)
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}
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}
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}
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}
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}
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