WKWebView高度更改

import UIKit
import WebKit

class ViewController: UIViewController, WKNavigationDelegate {
    var webView: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建WKWebView实例
        webView = WKWebView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height))
        webView.navigationDelegate = self
        view.addSubview(webView)
        
        // 加载网页内容
        let url = URL(string: "https://www.example.com")
        let request = URLRequest(url: url!)
        webView.load(request)
        
        // 监听contentSize变化
        webView.scrollView.addObserver(self, forKeyPath: "contentSize", options: .new, context: nil)
    }
    
    // contentSize变化的回调方法
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "contentSize" {
            // 根据新的contentSize调整WKWebView的高度
            let newContentSize = webView.scrollView.contentSize
            webView.frame.size.height = newContentSize.height
        }
    }
    
    // WKNavigationDelegate方法
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        // 网页加载完成后，更新WKWebView的高度
        let contentSize = webView.scrollView.contentSize
        webView.frame.size.height = contentSize.height
    }
}