iOS UIWebView goback或goforward总是自动重新加载webView，我如何停止webview重新加载？

import WebKit

class ViewController: UIViewController, WKNavigationDelegate {
    var webView: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let webConfiguration = WKWebViewConfiguration()
        webView = WKWebView(frame: view.bounds, configuration: webConfiguration)
        webView.navigationDelegate = self
        view.addSubview(webView)
        
        let url = URL(string: "https://example.com")
        let request = URLRequest(url: url!)
        webView.load(request)
    }
    
    // 控制网页加载行为
    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
        if navigationAction.navigationType == .back || navigationAction.navigationType == .forward {
            decisionHandler(.cancel) // 取消加载
            return
        }
        decisionHandler(.allow) // 允许加载
    }
}

import UIKit

class ViewController: UIViewController, UIWebViewDelegate {
    var webView: UIWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        webView = UIWebView(frame: view.bounds)
        webView.delegate = self
        view.addSubview(webView)
        
        let url = URL(string: "https://example.com")
        let request = URLRequest(url: url!)
        webView.loadRequest(request)
    }
    
    // 拦截请求并取消加载
    func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebView.NavigationType) -> Bool {
        if navigationType == .backForward || navigationType == .forward {
            return false // 取消加载
        }
        return true // 允许加载
    }
}