我想从外部将UILabel添加到我的库的集合视图单元格中

import UIKit

class MyCollectionViewCell: UICollectionViewCell {
    var label: UILabel!

    override init(frame: CGRect) {
        super.init(frame: frame)
        
        // 创建UILabel实例
        label = UILabel(frame: self.bounds)
        
        // 设置UILabel的属性
        label.textAlignment = .center
        label.textColor = .black
        
        // 将UILabel添加到集合视图单元格中
        self.addSubview(label)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath) as! MyCollectionViewCell
    
    // 设置UILabel的文本内容
    cell.label.text = "Hello World"
    
    return cell
}