mirror of
https://github.com/Instagram/IGListKit
synced 2026-04-22 22:17:57 +00:00
e965f28515
Summary: The "Tail Loading" example wasn't working correctly on some iPad variants as some of the screens were too large for the number of items in the collection. This diff: * Enables scroll bouncing regardless of content size * Adds more items to the list on iPad to ensure it always has some scrollable height. * Adds `invalidateLayout()` to view size changes in order to properly handle landscape/portrait rotations. * Hides the disclosure chevron by default (Since only the Demos view controller when running on iPhone needs it) Reviewed By: DimaVartanian Differential Revision: D47662107 fbshipit-source-id: a9b2ee532a84b62a387685da09c5ea532eb2c874
88 lines
2.9 KiB
Swift
88 lines
2.9 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: [Int] = {
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// Load more on iPad in order for the content size to be bigger than its screen.
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UIDevice.current.userInterfaceIdiom == .pad ? Array(0...30) : Array(0...15)
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}()
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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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collectionView.alwaysBounceVertical = true
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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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collectionView.collectionViewLayout.invalidateLayout()
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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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