自定义UITableViewCell UILabel错误的Swift核心数据

import UIKit

class CustomTableViewCell: UITableViewCell {
    var titleLabel: UILabel!

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        titleLabel = UILabel(frame: CGRect(x: 10, y: 10, width: contentView.frame.width - 20, height: contentView.frame.height - 20))
        titleLabel.textAlignment = .left
        titleLabel.textColor = .black
        titleLabel.font = UIFont.systemFont(ofSize: 16)
        contentView.addSubview(titleLabel)
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        titleLabel.frame = CGRect(x: 10, y: 10, width: contentView.frame.width - 20, height: contentView.frame.height - 20)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}