如何在WKWebView中设置默认缩放

import UIKit
import WebKit

class ViewController: UIViewController, WKNavigationDelegate, UIScrollViewDelegate {
    
    var webView: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let configuration = WKWebViewConfiguration()
        let preferences = WKPreferences()
        preferences.minimumZoomScale = 0.5 // 设置最小缩放比例
        preferences.maximumZoomScale = 2.0 // 设置最大缩放比例
        configuration.preferences = preferences
        
        webView = WKWebView(frame: view.bounds, configuration: configuration)
        webView.navigationDelegate = self
        webView.scrollView.delegate = self
        
        view.addSubview(webView)
        
        if let url = URL(string: "https://www.example.com") {
            let request = URLRequest(url: url)
            webView.load(request)
        }
    }
    
    // UIScrollViewDelegate方法，监听滚动事件
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        // 根据需要调整WebView的缩放比例
        // 例如，可以在滚动到一定位置时，自动调整缩放比例
    }
    
    // 其他WKNavigationDelegate方法...
}