我无法在UITableView的单元格中设置边距

class CustomTableViewCell: UITableViewCell {
    override func layoutSubviews() {
        super.layoutSubviews()
        contentView.frame = contentView.frame.inset(by: UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10))
    }
}

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    cell.contentView.frame = cell.contentView.frame.inset(by: UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10))
}

class CustomTableViewCell: UITableViewCell {
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        let margin: CGFloat = 10
        
        contentView.translatesAutoresizingMaskIntoConstraints = false
        contentView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: margin).isActive = true
        contentView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -margin).isActive = true
        contentView.topAnchor.constraint(equalTo: topAnchor, constant: margin).isActive = true
        contentView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -margin).isActive = true
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}