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add horizontal row to UICollectionViewCompositionalLayout example
Summary: Lets go even beyond the `MixedDataViewController` example by taking advantage of `orthogonalScrollingBehavior`. Really neat! Differential Revision: D52260531 fbshipit-source-id: aee8b38a38284104fa65ba8d33426a9e6216e503
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39 changes: 39 additions & 0 deletions
39
Examples/Examples-iOS/IGListKitExamples/Models/HorizontalCardsSection.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| import IGListKit | ||
| import Foundation | ||
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| final class HorizontalCardsSection: NSObject { | ||
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| let cardCount: Int | ||
| private(set) var items: [String] = [] | ||
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| init(cardCount: Int) { | ||
| self.cardCount = cardCount | ||
| super.init() | ||
| self.items = computeItems() | ||
| } | ||
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| private func computeItems() -> [String] { | ||
| return [Int](1...cardCount).map { | ||
| String(describing: $0) | ||
| } | ||
| } | ||
| } | ||
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| extension HorizontalCardsSection: ListDiffable { | ||
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| func diffIdentifier() -> NSObjectProtocol { | ||
| return self | ||
| } | ||
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| func isEqual(toDiffableObject object: ListDiffable?) -> Bool { | ||
| return self === object ? true : self.isEqual(object) | ||
| } | ||
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| } |
56 changes: 56 additions & 0 deletions
56
...les/SectionControllers/With Composable Layout/HorizontalComposableSectionController.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| import IGListKit | ||
| import UIKit | ||
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| final class HorizontalComposableSectionController: ListSectionController, CompositionLayoutCapable { | ||
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| private var object: HorizontalCardsSection? | ||
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| override func numberOfItems() -> Int { | ||
| return object?.cardCount ?? 0 | ||
| } | ||
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| override func sizeForItem(at index: Int) -> CGSize { | ||
| // Size handled by cell | ||
| return CGSizeZero | ||
| } | ||
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| override func cellForItem(at index: Int) -> UICollectionViewCell { | ||
| let cell: CompositionLayoutCell = collectionContext.dequeueReusableCell(for: self, at: index) | ||
| cell.text = object?.items[index] ?? "undefined" | ||
| cell.contentView.backgroundColor = UIColor.secondarySystemBackground | ||
| cell.contentView.layer.cornerRadius = 8 | ||
| return cell | ||
| } | ||
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| override func didUpdate(to object: Any) { | ||
| self.object = object as? HorizontalCardsSection | ||
| } | ||
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| // MARK: CompositionLayoutCapable | ||
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| func collectionViewSectionLayout(layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? { | ||
| // Item | ||
| let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), | ||
| heightDimension: .fractionalHeight(1.0)) | ||
| let item = NSCollectionLayoutItem(layoutSize: itemSize) | ||
| item.contentInsets = NSDirectionalEdgeInsets(top: 0, leading: 0, bottom: 0, trailing: 16) | ||
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| // Group | ||
| let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .absolute(160)) | ||
| let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize, subitems: [item]) | ||
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| // Section | ||
| let section = NSCollectionLayoutSection(group: group) | ||
| section.contentInsets = NSDirectionalEdgeInsets(top: 16, leading: 16, bottom: 16, trailing: 16) | ||
| section.orthogonalScrollingBehavior = .continuousGroupLeadingBoundary | ||
| return section | ||
| } | ||
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| } |
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