如何在UIStackView中设置排列子视图的自定义高度？

// 创建UIStackView对象
let stackView = UIStackView()

// 添加需要排列的子视图
let view1 = UIView()
let view2 = UIView()
let view3 = UIView()
stackView.addArrangedSubview(view1)
stackView.addArrangedSubview(view2)
stackView.addArrangedSubview(view3)

// 为每个子视图创建高度约束
let heightConstraint1 = view1.heightAnchor.constraint(equalToConstant: 50)
let heightConstraint2 = view2.heightAnchor.constraint(equalToConstant: 100)
let heightConstraint3 = view3.heightAnchor.constraint(equalToConstant: 80)

// 设置约束的优先级为非必须的
heightConstraint1.priority = .defaultLow
heightConstraint2.priority = .defaultLow
heightConstraint3.priority = .defaultLow

// 将约束添加到子视图
heightConstraint1.isActive = true
heightConstraint2.isActive = true
heightConstraint3.isActive = true

// 修改自定义高度
heightConstraint1.constant = 70

// 更新UIStackView的布局
stackView.setNeedsLayout()