我有一个使用iOS默认动态字体的项目。因此，我使用UITableViewAutomaticDimension作为高度。我以编程方式完成所有操作，因此我为自定义单元格设置了约束。

我对约束和UITableViewCell s的理解

根据我对约束的理解，当你将它们应用到superView时，你设置为受约束的属性将被迫根据superView的大小移动。但是，如果您将约束设置为UITableViewCell的contentView，则设置约束的属性将强制UITableViewCell更改其高度、宽度和ext。

CustomTableViewCell

import SnapKit

lazy var loadingIndicator: UIActivityIndicatorView = {
    let loadingIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)
    loadingIndicator.sizeToFit()

    loadingIndicator.autoresizingMask = [UIViewAutoresizing.flexibleHeight]
    loadingIndicator.hidesWhenStopped = true

    return loadingIndicator
}()

lazy var logoImageView: UIImageView = {
    let logoImageView = UIImageView()

    logoImageView.contentMode = UIViewContentMode.scaleAspectFit
    logoImageView.backgroundColor = UIColor.white

    logoImageView.clipsToBounds = true

    return logoImageView
}()

lazy var storeLabel: UILabel = {
    let storeLabel = UILabel()
    storeLabel.sizeToFit()

    storeLabel.font = UIFont.preferredFont(forTextStyle: .footnote)
    storeLabel.adjustsFontForContentSizeCategory = true
    storeLabel.textColor = UIColor.lightGray

    return storeLabel
}()

lazy var priceLabel: UILabel = {
    let priceLabel = UILabel()
    priceLabel.sizeToFit()

    priceLabel.font = UIFont.preferredFont(forTextStyle: .title1)
    priceLabel.adjustsFontForContentSizeCategory = true
    priceLabel.textColor = UIColor.black

    return priceLabel
}()

lazy private var stackView: UIStackView = {
    let stackView = UIStackView()
    stackView.sizeToFit()

    stackView.axis = UILayoutConstraintAxis.vertical
    stackView.alignment = UIStackViewAlignment.leading
    stackView.distribution = UIStackViewDistribution.fill
    stackView.spacing = 0

    return stackView
}()

lazy private var priceStackView: UIStackView = {
    let priceStackView = UIStackView()
    priceStackView.sizeToFit()

    priceStackView.axis = UILayoutConstraintAxis.horizontal
    priceStackView.alignment = UIStackViewAlignment.center
    priceStackView.distribution = UIStackViewDistribution.fill
    priceStackView.spacing = 0

    return priceStackView
}()

override func draw(_ rect: CGRect) {
    super.draw(rect)

    let margins = contentView.layoutMarginsGuide

    contentView.addSubview(logoImageView)
    contentView.addSubview(stackView)

    stackView.addArrangedSubview(storeLabel)
    stackView.addArrangedSubview(priceStackView)

    priceStackView.addArrangedSubview(loadingIndicator)
    priceStackView.addArrangedSubview(priceLabel)

    logoImageView.snp.makeConstraints { (make) in
        make.left.equalTo(layoutMarginsGuide).offset(layoutMargins.left * 0.5)
        make.centerY.height.equalTo(layoutMarginsGuide)
        make.width.equalTo(logoImageView.snp.height)
    }

    stackView.snp.makeConstraints { (make) in
        make.left.equalTo(logoImageView.snp.right).offset(layoutMargins.left * 1.5)
        make.right.centerY.equalTo(margins)
        make.height.equalTo(margins).offset(-15)
    }
}

输出

一切都应该工作得很好，但我没有得到desired height。
First高度，一秒钟后高度变为this，最终所需高度为this。是我设置了错误的约束，还是这只是一个普通的iOS bug？