如何显示分页scrollView的当前页数？

import UIKit

class ViewController: UIViewController, UIScrollViewDelegate {
    
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var pageControl: UIPageControl!
    
    let pageCount = 3 // 总页数
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        scrollView.delegate = self
        scrollView.isPagingEnabled = true
        
        // 设置scrollView的内容大小
        scrollView.contentSize = CGSize(width: scrollView.frame.width * CGFloat(pageCount), height: scrollView.frame.height)
        
        // 添加子视图到scrollView中
        for i in 0..<pageCount {
            let subView = UIView(frame: CGRect(x: scrollView.frame.width * CGFloat(i), y: 0, width: scrollView.frame.width, height: scrollView.frame.height))
            subView.backgroundColor = UIColor(red: CGFloat(i)/CGFloat(pageCount), green: 0, blue: 0, alpha: 1)
            scrollView.addSubview(subView)
        }
        
        // 设置UIPageControl的总页数
        pageControl.numberOfPages = pageCount
    }
    
    // scrollView滚动事件
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        let currentPage = Int(scrollView.contentOffset.x / scrollView.frame.width)
        pageControl.currentPage = currentPage
    }
}