mirror of
https://github.com/Instagram/IGListKit
synced 2026-04-25 15:37:38 +00:00
77a4582ce5
Summary: Lets try using `UICollectionViewCompositionalLayout` with IGListKit! It does require some data plumbing, but maybe we can make that simpler in the future. For now, lets keep things simple and see how it feels. This diff replicates the `MixedDataViewController` example starting with the expandable text. Differential Revision: D52260529 fbshipit-source-id: 5579b8d6fe5d1f95ed282f821e6555a6a56b1c1c
58 lines
1.9 KiB
Swift
58 lines
1.9 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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/// Like ExpandableSectionController, but supports UICollectionViewCompositionalLayout
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final class ExpandableComposableSectionController: ListSectionController, CompositionLayoutCapable {
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private var expanded = false
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private var object: String?
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override func sizeForItem(at index: Int) -> CGSize {
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// Size handled by cell
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return CGSizeZero
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}
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override func cellForItem(at index: Int) -> UICollectionViewCell {
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let cell: CompositionLayoutCell = collectionContext.dequeueReusableCell(for: self, at: index)
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cell.text = object
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cell.expanded = expanded
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return cell
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}
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override func didUpdate(to object: Any) {
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self.object = object as? String
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}
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override func didSelectItem(at index: Int) {
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expanded = !expanded
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guard let cell = collectionContext.cellForItem(at: index, sectionController: self) as? CompositionLayoutCell else {
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return
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}
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cell.expanded = expanded;
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UIView.animate(withDuration: 0.5,
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delay: 0,
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usingSpringWithDamping: 0.4,
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initialSpringVelocity: 0.6,
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options: [],
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animations: {
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self.collectionContext?.invalidateLayout(for: self)
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})
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}
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// MARK: CompositionLayoutCapable
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func collectionViewSectionLayout(layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? {
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let config = UICollectionLayoutListConfiguration(appearance: .plain)
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return NSCollectionLayoutSection.list(using: config, layoutEnvironment: layoutEnvironment)
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}
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}
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