mbrucedogs/block-employee-directory
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now using diffable datasource

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Signed-off-by: Matt Bruce <mbrucedogs@gmail.com>
This commit is contained in:
Matt Bruce 2025-01-21 13:31:46 -06:00
parent 3238defe84
commit 7501ce5936
2 changed files with 26 additions and 25 deletions
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2
EmployeeDirectory/Models/Employee.swift
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@ -27,7 +27,7 @@ public enum EmployeeType: String, Codable, CustomStringConvertible {
/// Employee Object
/// JSON Object defintion
/// - https://square.github.io/microsite/mobile-interview-project/
public struct Employee: Codable {
public struct Employee: Hashable, Codable {
/// The unique identifier for the employee. Represented as a UUID.
public let uuid: UUID

49
EmployeeDirectory/ViewControllers/EmployeesViewController.swift
View File

@ -34,24 +34,45 @@ class EmployeesViewController: UIViewController {
// Prevents multiple calls during rapid scrolling
private var isFetchingNextPage: Bool = false
private var dataSource: UITableViewDiffableDataSource<Int, Employee>!
// MARK: - Public Methods
public override func viewDidLoad() {
super.viewDidLoad()
setupUI()
setupDataSource()
bindViewModel()
viewModel.fetchEmployees()
}
// MARK: - Private Methods
private func setupDataSource() {
dataSource = UITableViewDiffableDataSource<Int, Employee>(tableView: tableView) { tableView, indexPath, employee in
guard let cell = tableView.dequeueReusableCell(withIdentifier: EmployeeTableViewCell.identifier,for: indexPath) as? EmployeeTableViewCell else {
return UITableViewCell()
}
cell.configure(with: EmployeeCellViewModel(employee: employee))
return cell
}
}
// MARK: - Snapshot Handling
private func applySnapshot(employees: [Employee]) {
var snapshot = NSDiffableDataSourceSnapshot<Int, Employee>()
snapshot.appendSections([0])
snapshot.appendItems(employees, toSection: 0)
dataSource.apply(snapshot, animatingDifferences: true)
}
/// Setup the UI by adding the views to the main view
private func setupUI() {
view.backgroundColor = .white
// Configure TableView
tableView.register(EmployeeTableViewCell.self, forCellReuseIdentifier: EmployeeTableViewCell.identifier)
tableView.dataSource = self
tableView.delegate = self
view.addSubview(tableView)
tableView.frame = view.bounds
@ -108,13 +129,9 @@ class EmployeesViewController: UIViewController {
/// Using the ViewModel setup combine handlers
private func bindViewModel() {
viewModel.$employees
.scan(([], [])) { previous, current in
(previous.1, current) // (oldValue, newValue)
}
.receive(on: RunLoop.main)
.sink { [weak self] oldValue, newValue in
self?.animateEmployeeChanges(from: oldValue, to: newValue)
self?.updateFooter()
.sink { [weak self] employees in
self?.applySnapshot(employees: employees)
}
.store(in: &cancellables)
@ -235,19 +252,3 @@ extension EmployeesViewController {
viewModel.changeMode(to: selectedMode)
}
}
/// Mark: - UITableViewDataSource
extension EmployeesViewController: UITableViewDataSource {
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return viewModel.employees.count
}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: EmployeeTableViewCell.identifier, for: indexPath) as? EmployeeTableViewCell else {
return UITableViewCell()
}
let employee = viewModel.employees[indexPath.row]
cell.configure(with: EmployeeCellViewModel(employee: employee))
return cell
}
}