从WKWebView获取favicon.co

import UIKit
import WebKit

class ViewController: UIViewController, WKNavigationDelegate {
    var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        webView = WKWebView(frame: self.view.frame)
        webView.navigationDelegate = self
        self.view.addSubview(webView)
        
        let url = URL(string: "https://www.example.com")!
        let request = URLRequest(url: url)
        webView.load(request)
    }
    
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        if let url = webView.url {
            let faviconURL = URL(string: "\(url.scheme)://\(url.host ?? "")/favicon.ico")!
            downloadFavicon(from: faviconURL)
        }
    }
    
    func downloadFavicon(from url: URL) {
        let task = URLSession.shared.dataTask(with: url) { data, response, error in
            if let data = data {
                // 处理下载的 favicon 数据
                print("Favicon downloaded: \(data)")
            } else if let error = error {
                print("Error downloading favicon: \(error.localizedDescription)")
            }
        }
        task.resume()
    }
}