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add swipe action to UICollectionViewCompositionalLayout example
Summary: Lets add swipe to delete. Differential Revision: D52262785 fbshipit-source-id: b95cdee116374c561967dd585d02110a4d877e16
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25 changes: 25 additions & 0 deletions
25
Examples/Examples-iOS/IGListKitExamples/Models/SwipeActionSection.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| /* | ||
| * 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 SwipeActionSection: NSObject { | ||
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| } | ||
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| extension SwipeActionSection: 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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| } |
68 changes: 68 additions & 0 deletions
68
...es/SectionControllers/With Composable Layout/SwipeActionComposabelSectionController.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| /* | ||
| * 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 SwipeActionComposabelSectionController: ListSectionController, CompositionLayoutCapable { | ||
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| private var object:SwipeActionSection? | ||
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| private var items = ["1. Swipe to delete me", "2. Swipe to delete me", "3. Swipe to delete me"] | ||
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| override func numberOfItems() -> Int { | ||
| return items.count | ||
| } | ||
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| override func sizeForItem(at index: Int) -> CGSize { | ||
| // Compositional layout doesn't request sizes per NSIndexPath | ||
| return CGSizeZero | ||
| } | ||
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| override func cellForItem(at index: Int) -> UICollectionViewCell { | ||
| let cell: CompositionLayoutCell = collectionContext.dequeueReusableCell(for: self, at: index) | ||
| cell.text = items[index] | ||
| return cell | ||
| } | ||
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| override func didUpdate(to object: Any) { | ||
| self.object = object as? SwipeActionSection | ||
| } | ||
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| func collectionViewSectionLayout(layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? { | ||
| var config = UICollectionLayoutListConfiguration(appearance: .plain) | ||
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| config.trailingSwipeActionsConfigurationProvider = {[weak self] indexPath in | ||
| // Sections should match, but just in case | ||
| guard let self = self, indexPath.section == self.section else { | ||
| return nil | ||
| } | ||
| return self.swipeActionFor(index: indexPath.item) | ||
| } | ||
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| return NSCollectionLayoutSection.list(using: config, layoutEnvironment: layoutEnvironment) | ||
| } | ||
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| // MARK: CompositionLayoutCapable | ||
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| private func swipeActionFor(index:Int) -> UISwipeActionsConfiguration? { | ||
| let action = UIContextualAction(style: .destructive, title: "Delete") {[weak self] action, view, block in | ||
| self?.deleteItem(index: index, block: block) | ||
| } | ||
| return UISwipeActionsConfiguration(actions: [action]) | ||
| } | ||
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| private func deleteItem(index:Int, block: @escaping (Bool) -> ()) { | ||
| self.collectionContext.performBatch(animated: true) {updates in | ||
| self.items.remove(at: index) | ||
| updates.delete(in: self, at: IndexSet(integer: index)) | ||
| } completion: { completed in | ||
| block(completed) | ||
| } | ||
| } | ||
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| } |
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