使用NSFetchedResultsController核心数据对TableView单元进行重新排序- Swift 3

import UIKit
import CoreData

class ViewController: UIViewController, UITableViewDataSource, NSFetchedResultsControllerDelegate {

    @IBOutlet weak var tableView: UITableView!
    
    var fetchedResultsController: NSFetchedResultsController<NSFetchRequestResult>!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建NSFetchRequest对象，并设置排序规则
        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "EntityName")
        let sortDescriptor = NSSortDescriptor(key: "propertyName", ascending: true)
        fetchRequest.sortDescriptors = [sortDescriptor]
        
        // 创建NSFetchedResultsController对象
        fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: managedObjectContext, sectionNameKeyPath: nil, cacheName: nil)
        fetchedResultsController.delegate = self
        
        // 执行数据获取和排序操作
        do {
            try fetchedResultsController.performFetch()
        } catch {
            print("Fetch error: \(error)")
        }
    }
    
    // NSFetchedResultsControllerDelegate委托方法
    func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        tableView.reloadData()
    }
    
    // UITableViewDataSource数据源方法
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        guard let sections = fetchedResultsController.sections else {
            return 0
        }
        let sectionInfo = sections[section]
        return sectionInfo.numberOfObjects
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CellIdentifier", for: indexPath)
        
        // 使用NSFetchedResultsController提供的方法获取排序后的数据
        let object = fetchedResultsController.object(at: indexPath) as! YourManagedObject
        
        // 在单元格中显示数据
        cell.textLabel?.text = object.propertyName
        
        return cell
    }
}