从另一个视图控制器导航栏加载视图控制器的UIWebView中的请求url

import UIKit
import WebKit

class ViewController: UIViewController, UIWebViewDelegate {
    var webView: UIWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建UIWebView
        webView = UIWebView(frame: view.bounds)
        webView.delegate = self
        view.addSubview(webView)
        
        // 创建导航栏按钮
        let loadButton = UIBarButtonItem(title: "加载", style: .plain, target: self, action: #selector(loadWebView))
        navigationItem.rightBarButtonItem = loadButton
    }
    
    @objc func loadWebView() {
        // 获取UIWebView对象
        guard let webView = webView else { return }
        
        // 加载URL请求到UIWebView中
        let url = URL(string: "https://www.example.com")!
        let request = URLRequest(url: url)
        webView.loadRequest(request)
    }
    
    // UIWebViewDelegate方法
    func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebView.NavigationType) -> Bool {
        // 判断请求的URL是否是需要加载的URL
        if let url = request.url, url.absoluteString == "https://www.example.com" {
            return true
        }
        return false
    }
}