Handle changes in array
protocol PresenterDelegate: ArrayChangeManagerDelegate {}
class Presenter<D: PresenterDelegate> where D.Object == Int {
weak var delegate: D? {
didSet {
arrayManager.delegate = delegate
}
}
private let arrayManager = D.Manager()
private(set) var array: [D.Object] {
get { return arrayManager.objects }
set { arrayManager.objects = newValue }
}
func test() {
DispatchQueue.concurrentPerform(iterations: 100) { _ in
arrayManager.cancelPreviousChanges()
array = (0..<random()).map { _ in random() }
}
}
private func random() -> Int {
return Int(arc4random_uniform(9) + 1)
}
}
import UIKit
final class ViewController: UITableViewController, PresenterDelegate {
// MARK: - UITableViewController
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return presenter.array.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
return UITableViewCell()
}
// MARK: - Manager
lazy var presenter: Presenter<ViewController> = {
let presenter = Presenter<ViewController>()
presenter.delegate = self
return presenter
}()
// MARK: - ManagerDelegate
typealias Object = Int
func objectAtIndex(_ change: Manager.ObjectChange, manager: Manager) {
switch change {
case .begin:
tableView.beginUpdates()
case .added(let position):
tableView.insertRows(at: [IndexPath(row: position, section: 0)], with: .fade)
case .moved(let at, let to):
tableView.moveRow(at: IndexPath(row: at, section: 0), to: IndexPath(row: to, section: 0))
case .deleted(let position):
tableView.deleteRows(at: [IndexPath(row: position, section: 0)], with: .fade)
case .end:
tableView.endUpdates()
case .new:
tableView.reloadData()
}
}
}
let controller = ViewController()
controller.presenter.test()