如何在UIScrollView中调用嵌入式ViewControllers生命周期- Swift -以编程方式

import UIKit

class EmbeddedViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // 初始化操作
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        // 更新视图数据
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        // 执行一些需要在视图显示后进行的操作
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        // 保存数据或执行一些清理操作
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        // 执行一些需要在视图消失后进行的操作
    }
}

class ViewController: UIViewController {
    let scrollView = UIScrollView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置UIScrollView的contentSize
        scrollView.contentSize = CGSize(width: view.frame.width, height: view.frame.height * 2)
        
        // 添加嵌入式ViewControllers
        let embeddedVC1 = EmbeddedViewController()
        let embeddedVC2 = EmbeddedViewController()
        
        addChild(embeddedVC1)
        scrollView.addSubview(embeddedVC1.view)
        embeddedVC1.didMove(toParent: self)
        
        addChild(embeddedVC2)
        scrollView.addSubview(embeddedVC2.view)
        embeddedVC2.didMove(toParent: self)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        // 调用嵌入式ViewControllers的生命周期方法
        let embeddedVC1 = children[0] as? EmbeddedViewController
        let embeddedVC2 = children[1] as? EmbeddedViewController
        
        embeddedVC1?.viewWillAppear(animated)
        embeddedVC2?.viewWillAppear(animated)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        // 调用嵌入式ViewControllers的生命周期方法
        let embeddedVC1 = children[0] as? EmbeddedViewController
        let embeddedVC2 = children[1] as? EmbeddedViewController
        
        embeddedVC1?.viewWillDisappear(animated)
        embeddedVC2?.viewWillDisappear(animated)
    }
}