Minimal UITableViewDiffableDataSource Playground

DiffableDataSource.swift

//
// Minimal code to get Diffable Data Sources working in a Playground. 
// Easier to understand than the WWDC examples.
//
// Paul Ossenbruggen
//
import UIKit
import PlaygroundSupport

let list = [
    "hello",
    "goodbye",
    "goodluck"
]

let list2 = [
    "ok",
    "done"
]

class ViewController: UITableViewController {
    enum Section: CaseIterable {
        case main
    }

    enum ItemType {
        case main
    }
    
    struct Item: Hashable {
        let title: String
        private let identifier = UUID()
        func hash(into hasher: inout Hasher) {
            hasher.combine(self.identifier)
        }
    }
    
    static let reuseID = "Cell"
    var currentSnapshot: NSDiffableDataSourceSnapshot<Section, Item>! = nil
    var dataSource: UITableViewDiffableDataSource<Section, Item>! = nil

    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: Self.reuseID)
        dataSource = UITableViewDiffableDataSource<Section, Item>(tableView: tableView) { tableView, indexPath, item in
            let cell = tableView.dequeueReusableCell(withIdentifier: Self.reuseID, for: indexPath)
            print(item.title)
            cell.textLabel?.text = item.title
            return cell
        }
        let items = list.map { Item(title: $0) }
        currentSnapshot = NSDiffableDataSourceSnapshot<Section, Item>()
        currentSnapshot.appendSections([.main])
        currentSnapshot.appendItems(items, toSection: .main)
        dataSource.apply(currentSnapshot, animatingDifferences: true)
        let items2 = list2.map { Item(title: $0) }
        currentSnapshot.appendItems(items2, toSection: .main)
        dataSource.apply(currentSnapshot, animatingDifferences: true)
        currentSnapshot.deleteItems([items[2]])
        dataSource.apply(currentSnapshot, animatingDifferences: true)
    }
}

let viewController = ViewController()
PlaygroundPage.current.setLiveView(viewController)