mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-04 05:58:37 +00:00
879260b417
Summary: https://github.com/Instagram/IGListKit/pull/209 Reviewed By: rnystrom Differential Revision: D4190633 fbshipit-source-id: 9d382b9ba3f3d20c8b9c48d900650ec354bc9728
84 lines
3 KiB
Swift
84 lines
3 KiB
Swift
/**
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Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
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The examples provided by Facebook are for non-commercial testing and evaluation
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purposes only. Facebook reserves all rights not expressly granted.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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import UIKit
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import IGListKit
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final class LoadMoreViewController: UIViewController, IGListAdapterDataSource, UIScrollViewDelegate {
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lazy var adapter: IGListAdapter = {
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return IGListAdapter(updater: IGListAdapterUpdater(), viewController: self, workingRangeSize: 0)
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}()
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let collectionView = IGListCollectionView(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 = NSObject()
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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: IGListAdapterDataSource
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func objects(for listAdapter: IGListAdapter) -> [IGListDiffable] {
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var objects = items as [IGListDiffable]
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if loading {
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objects.append(spinToken)
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}
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return objects
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}
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func listAdapter(_ listAdapter: IGListAdapter, sectionControllerFor object: Any) -> IGListSectionController {
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if let obj = object as? NSObject, 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: IGListAdapter) -> UIView? { return nil }
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//MARK: UIScrollViewDelegate
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func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, 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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