我在使用此UITableViewCell时遇到麻烦。我从服务器获取字符串并将其插入到viewDidLoad中，但是单元格的底部，即summaryLabel被遮盖了。是插图吗？ Here's the code：

class SummaryTableViewCell: UITableViewCell {
    let titleLabel = UILabel()
    let createdLabel = UILabel()
    let summaryLabel = UILabel()

    override init(style: UITableViewCell.CellStyle,reuseIdentifier: String?) {
        super.init(style: style,reuseIdentifier: reuseIdentifier)
        titleLabel.numberOfLines = 2
        titleLabel.lineBreakMode = .byWordWrapping
        titleLabel.font = UIFont.boldSystemFont(ofSize: 23)

        summaryLabel.numberOfLines = 4
        summaryLabel.lineBreakMode = .byWordWrapping

        contentView.clipsToBounds = true
        titleLabel.translatesAutoresizingMaskintoConstraints = false
        createdLabel.translatesAutoresizingMaskintoConstraints = false
        summaryLabel.translatesAutoresizingMaskintoConstraints = false

        contentView.addSubview(titleLabel)
        contentView.addSubview(createdLabel)
        contentView.addSubview(summaryLabel)
        let lg = contentView.safeAreaLayoutGuide
        NSLayoutConstraint.activate([
            titleLabel.topAnchor.constraint(equalTo: lg.topAnchor),titleLabel.leadingAnchor.constraint(equalTo: lg.leadingAnchor),titleLabel.trailingAnchor.constraint(equalTo: lg.trailingAnchor),titleLabel.bottomAnchor.constraint(equalTo: createdLabel.topAnchor),createdLabel.leadingAnchor.constraint(equalTo: lg.leadingAnchor),createdLabel.trailingAnchor.constraint(equalTo: lg.trailingAnchor),createdLabel.bottomAnchor.constraint(equalTo: summaryLabel.topAnchor,constant: -8),summaryLabel.leadingAnchor.constraint(equalTo: lg.leadingAnchor),summaryLabel.trailingAnchor.constraint(equalTo: lg.trailingAnchor),summaryLabel.bottomAnchor.constraint(equalTo: lg.bottomAnchor)
        ])
    }
    override func layoutSubviews() {
        super.layoutSubviews()
        contentView.frame = contentView.frame.inset(by: UIEdgeInsets(top: 15,left: 17,bottom: 15,right: 17))
    }
    required init?(coder aDecoder: NSCoder) {super.init(coder: aDecoder)}
}