Created
March 15, 2020 15:36
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| // | |
| // ProductsViewController.swift | |
| // Created by nori on 2020/03/15. | |
| // Copyright © 2020 nori. All rights reserved. | |
| // | |
| import UIKit | |
| import Instantiate | |
| import Firebase | |
| import Ballcap | |
| import SwiftUI | |
| import SwiftUICell | |
| class ProductsViewController: DataSourceViewController<Commerce.Product>, UICollectionViewDelegate { | |
| enum Section: Int { | |
| case main | |
| } | |
| struct _Cell: Cell { | |
| var text: String | |
| var body: some View { | |
| Text(text) | |
| } | |
| } | |
| lazy var dataSource: UICollectionViewDiffableDataSource<Section, ItemIdentifier> = { | |
| let dataSource = UICollectionViewDiffableDataSource<Section, ItemIdentifier>(collectionView: self.collectionView) { (collectionView, indexPath, id) -> UICollectionViewCell? in | |
| guard let data: Commerce.Product.Model = self.products[indexPath.item].data else { return nil } | |
| let cell = SwiftUICell<_Cell>.dequeue( | |
| collectionView: collectionView, | |
| indexPath: indexPath, | |
| contentView: _Cell(text: data.name), parent: self) | |
| return cell | |
| } | |
| return dataSource | |
| }() | |
| lazy var collectionView: UICollectionView = { | |
| let layout = UICollectionViewFlowLayout() | |
| layout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize | |
| layout.scrollDirection = .vertical | |
| let view: UICollectionView = UICollectionView(frame: self.view.bounds, collectionViewLayout: layout) | |
| view.alwaysBounceVertical = false | |
| view.backgroundColor = .secondarySystemBackground | |
| view.delegate = self | |
| view.register(content: _Cell.self) | |
| return view | |
| }() | |
| var products: [Commerce.Product] = [] | |
| override func loadView() { | |
| super.loadView() | |
| self.view.addSubview(collectionView) | |
| self.view.backgroundColor = .secondarySystemBackground | |
| } | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| var snapshot: NSDiffableDataSourceSnapshot<Section, ItemIdentifier> = NSDiffableDataSourceSnapshot() | |
| snapshot.appendSections([.main]) | |
| self.dataSource.apply(snapshot, animatingDifferences: true) | |
| self._dataSource | |
| .onChanged({ [weak self] (querySnapstho, dataSourceSnapshot) in | |
| guard var snapshot: NSDiffableDataSourceSnapshot<Section, ItemIdentifier> = self?.dataSource.snapshot() else { return } | |
| snapshot.deleteItems(dataSourceSnapshot.before.map { ItemIdentifier(rawValue: $0.path) }) | |
| snapshot.appendItems(dataSourceSnapshot.after.map { ItemIdentifier(rawValue: $0.path) }, toSection: .main) | |
| self?.dataSource.apply(snapshot, animatingDifferences: true) | |
| }) | |
| .get() | |
| } | |
| } | |
| struct _Cell_Previews: PreviewProvider { | |
| static var previews: some View { | |
| ProductsViewController._Cell(text: "text") | |
| .previewLayout(.fixed(width: UIScreen.main.bounds.width, height: 120)) | |
| } | |
| } |
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