如何使UIScrollview一次只显示一个子视图

import UIKit

class SingleChildScrollView: UIViewController {
    let scrollView = UIScrollView()
    let contentView = UIView()
    var subviews: [UIView] = []
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 初始化子视图
        for i in 0..<5 {
            let subview = UIView()
            subview.backgroundColor = .blue
            subview.frame = CGRect(x: 0, y: 0, width: view.bounds.width, height: view.bounds.height)
            subviews.append(subview)
        }
        
        // 设置UIScrollView
        scrollView.frame = view.bounds
        scrollView.delegate = self
        scrollView.showsHorizontalScrollIndicator = false
        scrollView.showsVerticalScrollIndicator = false
        scrollView.isPagingEnabled = true
        
        // 设置contentView
        contentView.frame = CGRect(x: 0, y: 0, width: view.bounds.width * CGFloat(subviews.count), height: view.bounds.height)
        contentView.addSubview(subviews[0])
        
        // 将contentView添加到scrollView
        scrollView.addSubview(contentView)
        view.addSubview(scrollView)
        
        // 设置初始偏移量
        scrollView.contentOffset = CGPoint(x: 0, y: 0)
    }
}

extension SingleChildScrollView: UIScrollViewDelegate {
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        let pageWidth = scrollView.bounds.width
        let page = Int((scrollView.contentOffset.x + pageWidth / 2) / pageWidth)
        
        // 动态调整子视图的位置
        for i in 0..<subviews.count {
            subviews[i].frame = CGRect(x: CGFloat(i) * pageWidth, y: 0, width: pageWidth, height: scrollView.bounds.height)
        }
    }
}