UITableViewCell的内容视图高度未针对动态字体进行调整（NSLayoutConstraints）

Question

我在调整表格视图单元格以自动调整动态类型字体的大小时遇到困难。请注意，我在代码中使用布局约束，而不是在故事板中。

以下是我的表视图设置代码：

tableView = UITableView(frame: .zero, style: .grouped)
tableView.register(ChatAnalyticsCell.self, forCellReuseIdentifier: ChatAnalyticsCell.reuseIdentifier)
tableView.rowHeight = UITableView.automaticDimension
tableView.estimatedRowHeight = UITableView.automaticDimension

以下是我在ChatAnalyticsCell类中的2个标签和图像视图设置

private var iconImageView: UIImageView = {
    let imageView = UIImageView(frame: CGRect(origin: .zero,
                                              size: CGSize(width: 20, height: 20)))
    imageView.contentMode = .scaleAspectFill
    imageView.clipsToBounds = true
    imageView.translatesAutoresizingMaskIntoConstraints = false
    imageView.tintColor = UIColor(red: 0.25, green: 0.3, blue: 0.72, alpha: 1)
    return imageView
}()

private var segmentLabel: UILabel = {
    let label = UILabel()
    label.translatesAutoresizingMaskIntoConstraints = false
    label.numberOfLines = 0
    label.textColor = UIColor.gray
    label.font = UIFont.preferredFont(forTextStyle: .footnote)
    label.adjustsFontForContentSizeCategory = true

    return label
}()

private var segmentDataLabel: UILabel = {
    let label = UILabel()
    label.translatesAutoresizingMaskIntoConstraints = false
    label.numberOfLines = 0
    label.textColor = UIColor(red: 0.13, green: 0.15, blue: 0.19, alpha: 0.9)
    label.font = UIFont.preferredFont(forTextStyle: .body)
    label.adjustsFontForContentSizeCategory = true
    return label
}()

这里是我添加子视图和设置约束的函数，以正确调整动态类型字体的大小。

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

    setupSubviews()
}


private func setupSubviews() {
    addSubview(iconImageView)
    iconImageView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 15.0).isActive = true
    iconImageView.centerYAnchor.constraint(equalTo: contentView.centerYAnchor).isActive = true
    iconImageView.widthAnchor.constraint(equalToConstant: 20.0).isActive = true
    iconImageView.heightAnchor.constraint(equalToConstant: 20.0).isActive = true

    // Analytics segment label
    addSubview(segmentLabel)
    segmentLabel.leadingAnchor.constraint(equalTo: iconImageView.trailingAnchor, constant: 20).isActive = true
    segmentLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 20).isActive = true
    segmentLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -20).isActive = true

    // Segment data label
    addSubview(segmentDataLabel)
    segmentDataLabel.leadingAnchor.constraint(equalTo: segmentLabel.leadingAnchor).isActive = true
    segmentDataLabel.trailingAnchor.constraint(equalTo: segmentLabel.trailingAnchor).isActive = true
    segmentDataLabel.topAnchor.constraint(equalTo: segmentLabel.bottomAnchor, constant: 5).isActive = true
    segmentDataLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: 20).isActive = true

    contentView.heightAnchor.constraint(greaterThanOrEqualToConstant: 80).isActive = true
}

请注意，当我运行代码时，没有破坏任何约束，但布局没有正确更新。请查看屏幕截图：

Answer 1

将所有视图添加到内容视图中！

contentView.addSubview(yourView)

还有一件事——你可能想改变（为什么？）这个约束，

segmentDataLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: 20).isActive = true

到，

segmentDataLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -20).isActive = true

其余的约束看起来可以计算contentView的高度。