如何在TableView中的一行ImageView的上方和下方添加空格？

import UIKit

class CustomTableViewCell: UITableViewCell {
    private let imageViewSpacing: CGFloat = 10.0
    
    private var customImageView: UIImageView!
    private var topSpacingView: UIView!
    private var bottomSpacingView: UIView!
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        customImageView = UIImageView()
        customImageView.contentMode = .scaleAspectFit
        contentView.addSubview(customImageView)
        
        topSpacingView = UIView()
        topSpacingView.backgroundColor = .clear
        contentView.addSubview(topSpacingView)
        
        bottomSpacingView = UIView()
        bottomSpacingView.backgroundColor = .clear
        contentView.addSubview(bottomSpacingView)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        let imageSize = contentView.bounds.height - 2 * imageViewSpacing
        customImageView.frame = CGRect(x: (contentView.bounds.width - imageSize) / 2, y: imageViewSpacing, width: imageSize, height: imageSize)
        
        topSpacingView.frame = CGRect(x: 0, y: 0, width: contentView.bounds.width, height: imageViewSpacing)
        
        bottomSpacingView.frame = CGRect(x: 0, y: contentView.bounds.height - imageViewSpacing, width: contentView.bounds.width, height: imageViewSpacing)
    }
}

// 在UITableView的数据源方法中使用自定义的TableViewCell类
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath) as! CustomTableViewCell
    
    // 设置cell的图片和其他内容
    
    return cell
}