以编程方式在UIStackView中插入UIScrollView

import UIKit

class ViewController: UIViewController {
    
    let stackView = UIStackView()
    let scrollView = UIScrollView()
    let contentView = UIView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置 stackView
        stackView.axis = .vertical
        stackView.alignment = .center
        stackView.distribution = .fillEqually
        stackView.spacing = 10
        
        // 设置 scrollView
        scrollView.showsVerticalScrollIndicator = true
        
        // 设置 contentView
        contentView.translatesAutoresizingMaskIntoConstraints = false
        
        // 将 contentView 添加到 scrollView
        scrollView.addSubview(contentView)
        
        // 将 scrollView 添加到 stackView
        stackView.addArrangedSubview(scrollView)
        
        // 将 stackView 添加到 view
        view.addSubview(stackView)
        
        // 设置约束
        stackView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            stackView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
            stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            stackView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
        ])
        
        // 设置 contentView 的约束
        contentView.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
        contentView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true
        contentView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor).isActive = true
        contentView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true
        contentView.widthAnchor.constraint(equalTo: scrollView.widthAnchor).isActive = true
        
        // 添加一些内容到 contentView
        let label = UILabel()
        label.text = "这是一个很长的文本内容，用于演示UIScrollView在UIStackView中的使用。"
        label.numberOfLines = 0
        contentView.addSubview(label)
        
        label.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            label.topAnchor.constraint(equalTo: contentView.topAnchor),
            label.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
            label.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
            label.bottomAnchor.constraint(equalTo: contentView.bottomAnchor)
        ])
    }
}