如何在启用分页的情况下实现UIScrollView平铺？

import UIKit

class ViewController: UIViewController, UIScrollViewDelegate {
    
    let scrollView = UIScrollView()
    let numberOfPages = 3
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        scrollView.frame = view.bounds
        scrollView.contentSize = CGSize(width: view.bounds.width * CGFloat(numberOfPages), height: view.bounds.height)
        scrollView.isPagingEnabled = true
        scrollView.delegate = self
        
        for i in 0..<numberOfPages {
            let pageView = UIView(frame: CGRect(x: view.bounds.width * CGFloat(i), y: 0, width: view.bounds.width, height: view.bounds.height))
            pageView.backgroundColor = UIColor(red: CGFloat(i)/CGFloat(numberOfPages), green: 0.5, blue: 0.5, alpha: 1.0)
            scrollView.addSubview(pageView)
        }
        
        view.addSubview(scrollView)
    }
    
    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        let currentPage = Int(scrollView.contentOffset.x / scrollView.bounds.width)
        let targetOffsetX = CGFloat(currentPage) * scrollView.bounds.width
        scrollView.setContentOffset(CGPoint(x: targetOffsetX, y: 0), animated: true)
    }
}