使用Swift自动重新排序核心数据中的UICollectionView

import UIKit

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
    var dataItems = ["Item 1", "Item 2", "Item 3", "Item 4", "Item 5"]
    @IBOutlet weak var collectionView: UICollectionView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置UICollectionView的数据源和代理
        collectionView.dataSource = self
        collectionView.delegate = self
        
        // 注册UICollectionViewCell
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
        
        // 添加一个重新排序的按钮
        let reorderButton = UIBarButtonItem(title: "Reorder", style: .plain, target: self, action: #selector(reorderButtonTapped))
        navigationItem.rightBarButtonItem = reorderButton
    }
    
    // UICollectionViewDataSource方法
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return dataItems.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
        cell.backgroundColor = .lightGray
        cell.textLabel?.text = dataItems[indexPath.item]
        return cell
    }
    
    // 重新排序按钮的点击事件
    @objc func reorderButtonTapped() {
        // 随机重新排序数据源数组
        dataItems.shuffle()
        
        // 刷新UICollectionView
        collectionView.reloadData()
    }
}