iPhone UIWebView 宽度在缩放操作 + UIInterfaceOrientation 更改后不适合

，并添加案例代码。

swift
class ViewController: UIViewController, UIWebViewDelegate {
    var webView: UIWebView!
    override func viewDidLoad() {
        super.viewDidLoad()
        webView = UIWebView(frame: CGRect(x: 0, y: 0, width: self.view.frame.width / 2, height: self.view.frame.height))
        webView.delegate = self
        self.view.addSubview(webView)
        
        // 加载网页内容
        let url = URL(string: "https://www.example.com")
        let request = URLRequest(url: url!)
        webView.loadRequest(request)
    }
    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransition(to: size, with: coordinator)
        // 方向改变时重新设置UIWebView的宽度
        webView.frame = CGRect(x: 0, y: 0, width: size.width / 2, height: size.height)
    }
}