UIStackView中的多行UILabel问题

let label = UILabel()
label.numberOfLines = 0 // 设置为 0 表示不限制行数
label.lineBreakMode = .byWordWrapping // 按单词换行

let stackView = UIStackView()
stackView.axis = .vertical // 垂直排列
stackView.alignment = .leading // 对齐方式

let stackView = UIStackView()
stackView.spacing = 8 // 设置间距

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let stackView = UIStackView()
        stackView.axis = .vertical
        stackView.alignment = .leading
        stackView.spacing = 8
        stackView.translatesAutoresizingMaskIntoConstraints = false
        
        let label1 = UILabel()
        label1.text = "This is a multi-line label."
        label1.numberOfLines = 0
        label1.lineBreakMode = .byWordWrapping
        
        let label2 = UILabel()
        label2.text = "Another multi-line label with more text to demonstrate the issue."
        label2.numberOfLines = 0
        label2.lineBreakMode = .byWordWrapping
        
        stackView.addArrangedSubview(label1)
        stackView.addArrangedSubview(label2)
        
        view.addSubview(stackView)
        
        NSLayoutConstraint.activate([
            stackView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20),
            stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20)
        ])
    }
}