当约束布局在ScrollView中时，如何修复底部导航栏？

let scrollView = UIScrollView()
let containerView = UIView()
let bottomNavigationBar = UIView()

// 将容器视图添加到ScrollView中
scrollView.addSubview(containerView)

// 将底部导航栏添加到容器视图中
containerView.addSubview(bottomNavigationBar)

// 使用Auto Layout设置约束
containerView.translatesAutoresizingMaskIntoConstraints = false
bottomNavigationBar.translatesAutoresizingMaskIntoConstraints = false

NSLayoutConstraint.activate([
    containerView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor),
    containerView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor),
    containerView.topAnchor.constraint(equalTo: scrollView.topAnchor),
    containerView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),
    containerView.widthAnchor.constraint(equalTo: scrollView.widthAnchor),
    
    bottomNavigationBar.leadingAnchor.constraint(equalTo: containerView.leadingAnchor),
    bottomNavigationBar.trailingAnchor.constraint(equalTo: containerView.trailingAnchor),
    bottomNavigationBar.bottomAnchor.constraint(equalTo: containerView.safeAreaLayoutGuide.bottomAnchor),
    bottomNavigationBar.heightAnchor.constraint(equalToConstant: 50) // 设置底部导航栏的高度
])

// 设置ScrollView的contentSize
scrollView.contentSize = containerView.bounds.size