UIWebView scalesPageToFit = true不起作用

Question

我是IOS Swift的新手，需要一些帮助。我已经关注了本论坛中发现的其他例子，但没有运气。 无论我做什么，网页都不会扩展以适应UIwebview。

请帮忙。

以下是代码

import UIKit

class ViewController: UIViewController, UIWebViewDelegate  {

    @IBOutlet var webView: UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = NSURL (string: "https://www.bbc.co.uk");        
        let requestObj = NSURLRequest(URL: url!);        
        webView.scalesPageToFit = true
        webView.contentMode = UIViewContentMode.ScaleAspectFit        
        webView.delegate = self;       
        webView.frame = self.view.bounds    

    webView.stringByEvaluatingJavaScriptFromString("document.body.style.zoom= 5.0;")
        webView.loadRequest(requestObj);

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func webViewDidFinishLoad(webView: UIWebView) {
        let zoom = webView.bounds.size.width / webView.scrollView.contentSize.width
        webView.scrollView.setZoomScale(zoom, animated: true)
    }
}