Tableview单元格边框在swift中未占据全宽

let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
cell.contentView.addSubview(label)

NSLayoutConstraint.activate([
    label.leadingAnchor.constraint(equalTo: cell.contentView.leadingAnchor),
    label.trailingAnchor.constraint(equalTo: cell.contentView.trailingAnchor),
    // 其他约束...
])

cell.indentationLevel = 0

override func layoutSubviews() {
    super.layoutSubviews()
    // 确保子视图正确布局
}

tableView.separatorStyle = .singleLine
tableView.separatorInset = UIEdgeInsets.zero
tableView.separatorColor = UIColor.black

class CustomTableViewCell: UITableViewCell {
    let label = UILabel()

    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        setupViews()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setupViews() {
        contentView.addSubview(label)
        label.translatesAutoresizingMaskIntoConstraints = false

        NSLayoutConstraint.activate([
            label.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
            label.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
            label.topAnchor.constraint(equalTo: contentView.topAnchor),
            label.bottomAnchor.constraint(equalTo: contentView.bottomAnchor)
        ])
    }
}