Ios 如何更改UIWebView中的src值？

在UIWebview中，我要更改

<iframe src=“//player.vimeo.com/video/164231311?autoplay=1” width=“700" height=“394” frameborder=“0" webkitallowfullscreen=“” mozallowfullscreen=“” allowfullscreen=“”></iframe>

到目前为止还没有成功

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在这里，我制作了粗略的演示代码来解决您的问题。把你的逻辑放在这上面，它会解决你的问题。 它经过测试，似乎工作得很好

import UIKit

class ViewController: UIViewController,UIWebViewDelegate {

    @IBOutlet weak var webView: UIWebView!
    override func viewDidLoad() {
        super.viewDidLoad()
        webView.delegate = self
        webView.loadRequest(URLRequest(url: URL(string: "file:///Users/user/Downloads/index.html")!))
        // Do any additional setup after loading the view, typically from a nib.
    }

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

    func webViewDidFinishLoad(_ webView: UIWebView) {
        // get your current iframe src value
        let iframeSrcValue:String = webView.stringByEvaluatingJavaScript(from: "document.getElementsByTagName('iframe')[0].src")!

        // Here is your current value with AutoPlay
        print(iframeSrcValue)

        //Create new URL without Auto Play
        let modifiedSrcValue = "https://www.youtube.com/embed/td8pYyuCIIs"

        // Apply it to webview
        let evaluate: String = "document.getElementsByTagName('iframe')[0].src='\(modifiedSrcValue)';"
        webView.stringByEvaluatingJavaScript(from: evaluate)
    }

}

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非常感谢@arunjos007！我使用了你的建议并做了一些修改，结果非常好！

webView.stringByEvaluatingJavaScript(from:“document.getElementsByTagName(…) 

import UIKit

class ViewController: UIViewController,UIWebViewDelegate {

    @IBOutlet weak var webView: UIWebView!
    override func viewDidLoad() {
        super.viewDidLoad()
        webView.delegate = self
        webView.loadRequest(URLRequest(url: URL(string: "file:///Users/user/Downloads/index.html")!))
        // Do any additional setup after loading the view, typically from a nib.
    }

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

    func webViewDidFinishLoad(_ webView: UIWebView) {
        // get your current iframe src value
        let iframeSrcValue:String = webView.stringByEvaluatingJavaScript(from: "document.getElementsByTagName('iframe')[0].src")!

        // Here is your current value with AutoPlay
        print(iframeSrcValue)

        //Create new URL without Auto Play
        let modifiedSrcValue = "https://www.youtube.com/embed/td8pYyuCIIs"

        // Apply it to webview
        let evaluate: String = "document.getElementsByTagName('iframe')[0].src='\(modifiedSrcValue)';"
        webView.stringByEvaluatingJavaScript(from: evaluate)
    }

}