通过父视图中的PageControl更改ContainerView中的IBAction

import UIKit

class ParentViewController: UIViewController {

    @IBOutlet weak var pageControl: UIPageControl!
    @IBOutlet weak var containerView: UIView!
    
    var childViewControllers: [UIViewController] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建多个子视图控制器，并添加到数组中
        let firstVC = FirstViewController()
        let secondVC = SecondViewController()
        let thirdVC = ThirdViewController()
        
        childViewControllers = [firstVC, secondVC, thirdVC]
        
        // 将第一个子视图控制器添加到ContainerView中
        addChild(firstVC)
        containerView.addSubview(firstVC.view)
        firstVC.view.frame = containerView.bounds
        firstVC.didMove(toParent: self)
        
        // 设置PageControl的页数为子视图控制器的数量
        pageControl.numberOfPages = childViewControllers.count
    }
    
    @IBAction func pageControlValueChanged(_ sender: UIPageControl) {
        // 获取当前选中的页数
        let currentPage = sender.currentPage
        
        // 移除当前显示的子视图控制器
        let currentChildVC = childViewControllers[currentPage]
        currentChildVC.willMove(toParent: nil)
        currentChildVC.view.removeFromSuperview()
        currentChildVC.removeFromParent()
        
        // 添加新的子视图控制器
        let newChildVC = childViewControllers[currentPage]
        addChild(newChildVC)
        containerView.addSubview(newChildVC.view)
        newChildVC.view.frame = containerView.bounds
        newChildVC.didMove(toParent: self)
    }
}