reloadData后UICollectionViewCell约束错误

Question

这是我自定义的 UICollectionViewCell 代码。我只是在 configureViews() 函数中给子视图一个约束。

class CategoryCell: UICollectionViewCell {
  private lazy var containerStackView: UIStackView = {
    let stackView = UIStackView()
    stackView.axis = .vertical
    stackView.alignment = .fill
    stackView.distribution = .fill
    stackView.spacing = AppLayoutGuidance.spacingHalf
    let widthConstant = floor((UIScreen.main.bounds.size.width) / 3)
    NSLayoutConstraint.activate([
      stackView.widthAnchor.constraint(equalToConstant: widthConstant),
    ])
    return stackView
  }()

  private lazy var nameLabel: UILabel = {
    let label = PaddingLabel()
    label.numberOfLines = 1
    label.adjustsFontForContentSizeCategory = true
    label.font = UIFont.boldSystemFont(ofSize: UIFont.preferredFont(forTextStyle: .subheadline).pointSize)
    label.textAlignment = .center
    return label
  }()

  private lazy var bottomLine = UIView()

  override init(frame: CGRect) {
    super.init(frame: frame)
    configureViews()
  }

  required init?(coder: NSCoder) {
    super.init(coder: coder)
    configureViews()
  }

  override func prepareForReuse() {
    super.prepareForReuse()
    nameLabel.text = nil
  }
}

private extension CategoryCell {
  func configureViews() {
    contentView.addSameSizeConstrained(subView: containerStackView)
    containerStackView.addArrangedSubview(nameLabel)
    containerStackView.addArrangedSubview(bottomLine)

    bottomLine.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      bottomLine.heightAnchor.constraint(equalToConstant: AppLayoutGuidance.spacingHalf / 4),
    ])
  }
}

cell第一次渲染的时候没有问题，但是调用collectionView.reloadData()函数的时候，console出现constraint error。你有什么想法吗？