create a table using diffable data sources in swift

Here are the steps to create a table using diffable data sources in Swift:

Create a table view in your storyboard or programmatically.
Create a swift file for your view controller and import UIKit and CoreData framework.
Add a table view outlet in your view controller file, and conform to UITableViewDataSource protocol.
In the viewDidLoad() method, initialize the data source and snapshot, set the data source for the table view to the diffable data source and register your cell to the tableview.
Create a function to fetch your data, create an NSFetchRequest, and execute it with the context.
In the completion handler of the fetch request, update the snapshot with the fetched results.

Here's the code you may use as reference for the above steps:


main.swift
import UIKit
import CoreData

class ViewController: UIViewController, UITableViewDataSource {

    @IBOutlet weak var tableView: UITableView!

    private var dataSource: UITableViewDiffableDataSource<Section, Item>!
    private var managedObjectContext: NSManagedObjectContext!

    override func viewDidLoad() {
        super.viewDidLoad()

        tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")

        dataSource = UITableViewDiffableDataSource<Section, Item>(tableView: tableView, cellProvider: { (tableView, indexPath, item) -> UITableViewCell? in
            let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
            cell.textLabel?.text = item.title
            return cell
        })

        let appDelegate = UIApplication.shared.delegate as! AppDelegate
        managedObjectContext = appDelegate.persistentContainer.viewContext

        fetchData()

    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 0 // set this based on your data 
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        return cell
    }

    enum Section {
        case main
    }

    struct Item: Hashable {
        let id: UUID = UUID()
        let title: String
    }

    func fetchData() {
        let request: NSFetchRequest<Item> = Item.fetchRequest()

        do {
            let items = try managedObjectContext.fetch(request)
            var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
            snapshot.appendSections([.main])
            snapshot.appendItems(items, toSection: .main)
            dataSource.apply(snapshot, animatingDifferences: true)
        } catch {
            print(error.localizedDescription)
        }
    }
}
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Note: In this implementation, we use a Core Data managedObjectContext to fetch the data, but it can be replaced with any other data source. You will also need to change the "Item" struct to your data model type that conforms to the Hashable protocol.

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related categories

swift

diffable-data-sources

tableview