使用swift在滚动视图内的stackview中更改in按钮中的标题

import UIKit

class ViewController: UIViewController {
    
    let scrollView = UIScrollView()
    let stackView = UIStackView()
    let button = UIButton(type: .system)
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置 UIScrollView
        scrollView.frame = view.bounds
        scrollView.contentSize = CGSize(width: view.bounds.width, height: view.bounds.height * 2)
        
        // 设置 UIStackView
        stackView.axis = .vertical
        stackView.alignment = .center
        stackView.spacing = 20
        
        // 设置 UIButton
        button.setTitle("Initial Title", for: .normal)
        button.addTarget(self, action: #selector(changeButtonTitle), for: .touchUpInside)
        
        // 将 UIButton 添加到 UIStackView
        stackView.addArrangedSubview(button)
        
        // 将 UIStackView 添加到 UIScrollView
        scrollView.addSubview(stackView)
        
        // 设置 UIStackView 的约束
        stackView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            stackView.topAnchor.constraint(equalTo: scrollView.topAnchor),
            stackView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor),
            stackView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor),
            stackView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor)
        ])
    }
    
    @objc func changeButtonTitle() {
        button.setTitle("New Title", for: .normal)
    }
}

@objc func changeButtonTitle() {
    button.setTitle("New Title", for: .normal)
    button.titleLabel?.text = "New Title" // 确保标题更新
}