未使用数据从数组填充UICollectionView

import UIKit

class MyViewController: UIViewController, UICollectionViewDataSource {
    var collectionView: UICollectionView!
    var data: [String] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建UICollectionView实例
        let layout = UICollectionViewFlowLayout()
        collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
        collectionView.dataSource = self
        view.addSubview(collectionView)
        
        // 注册自定义的UICollectionViewCell
        collectionView.register(MyCollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
        
        // 填充数组
        data = ["Item 1", "Item 2", "Item 3", "Item 4", "Item 5"]
        
        // 刷新UICollectionView
        collectionView.reloadData()
    }
    
    // 实现UICollectionViewDataSource协议方法
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return data.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! MyCollectionViewCell
        cell.textLabel.text = data[indexPath.item]
        return cell
    }
}

class MyCollectionViewCell: UICollectionViewCell {
    var textLabel: UILabel!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        textLabel = UILabel(frame: contentView.bounds)
        textLabel.textAlignment = .center
        contentView.addSubview(textLabel)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}