使用Swift 4关闭WKWebView并更改ViewController

import UIKit
import WebKit

class ViewController: UIViewController {

    var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        webView = WKWebView(frame: view.bounds)
        view.addSubview(webView)
    }

    // 其他代码...
}

let url = URL(string: "https://www.example.com")
let request = URLRequest(url: url!)
webView.load(request)

extension ViewController: WKNavigationDelegate {

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        // 网页加载完成后执行的操作

        // 关闭WKWebView
        webView.removeFromSuperview()

        // 创建新的ViewController
        let newViewController = NewViewController()
        // 进行页面切换
        navigationController?.pushViewController(newViewController, animated: true)
    }
}

override func viewDidLoad() {
    super.viewDidLoad()

    webView = WKWebView(frame: view.bounds)
    webView.navigationDelegate = self
    view.addSubview(webView)
}