A simple example that shows how to use UITableViewDiffableDataSource.

UITableViewDiffableDataSource.swift

typealias SectionType: Hashable // The type you're using to identify sections.
typealias DataType: Hashable // The type of the data you're displaying.

let dataSource = UITableViewDiffableDataSource<SectionType, DataType>(
    tableView: tableView,
    cellProvider: {(tableView, indexPath, data) in
        // construct and return a cell here
    }
)

tableView.dataSource = dataSource
tableView.delegate = self

var snapshot = NSDiffableDataSourceSnapshot<SectionType, DataType>()
snapshot.appendSections(sections) // Where sections is an array of SectionTypes that uniquely identify each section.
sections.forEach { snapshot.appendItems($0.items, toSection: $0 }
dataSource.apply(snapshot, animatingDifferences: true)