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| import UIKit | |
| class ViewController: UIViewController { | |
| let tableView: UITableView = { | |
| let tableView = UITableView() | |
| tableView.translatesAutoresizingMaskIntoConstraints = false | |
| tableView.register(ItemCell.self, forCellReuseIdentifier: "ItemCell") | |
| return tableView | |
| }() | |
| lazy var tableViewDataSource = TableViewDataSource(tableView: tableView) | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| setup() | |
| } | |
| func setup() { | |
| view.addSubview(tableView) | |
| NSLayoutConstraint.activate([ | |
| tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor), | |
| tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor), | |
| tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor), | |
| tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor) | |
| ]) | |
| let item = UIBarButtonItem(image: .add, style: .plain, target: self, action: #selector(addItem)) | |
| navigationItem.rightBarButtonItem = item | |
| tableViewDataSource.snapshotData(items: (1...2).map{ Item(text: "Demo \($0)") }) | |
| } | |
| @objc | |
| func addItem() { | |
| let item = Item(text: "demo") | |
| tableViewDataSource.snapshotData(items: [item]) | |
| } | |
| } | |
| class ItemCell: UITableViewCell { | |
| override var reuseIdentifier: String? { | |
| "ItemCell" | |
| } | |
| } | |
| struct Item: Hashable, Identifiable { | |
| let id: UUID = UUID() | |
| let text: String | |
| } | |
| class TableViewDataSource { | |
| enum Section { | |
| case main | |
| } | |
| typealias DataSource = UITableViewDiffableDataSource<Section, Item> | |
| typealias Snapshot = NSDiffableDataSourceSnapshot<Section, Item> | |
| private let tableView: UITableView | |
| var snapshot = Snapshot() | |
| lazy var dataSource = DataSource(tableView: tableView) { tableView, indexPath, itemIdentifier in | |
| let cell = tableView.dequeueReusableCell(withIdentifier: "ItemCell", for: indexPath) | |
| var config = cell.defaultContentConfiguration() | |
| config.text = itemIdentifier.text | |
| cell.contentConfiguration = config | |
| return cell | |
| } | |
| init(tableView: UITableView) { | |
| self.tableView = tableView | |
| snapshot.appendSections([.main]) | |
| } | |
| func snapshotData(items: [Item]) { | |
| snapshot.appendItems(items, toSection: .main) | |
| dataSource.apply(snapshot) | |
| } | |
| } |
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