url - 从UIWebView获取YouTube网址

Question

如何从在UIWebView中播放的youtube视频获取网址？

Answer 1

将YouTube视频加载到webView之后，我创建了一个按钮，用户可以点击该按钮将URL复制到同一页面上的文本字段。诀窍是获取页面的innerHTML，然后查找YouTube ID。然后，使用该ID，我将其放入完整的网址中，以便用户可以保存链接并在以后播放视频，而不必再次在YouTube网站上查找该视频。 (顺便说一句，我有我自己的displayAlert，它可以将给定的消息并在UIWebView中未加载视频或加载了许多视频时将其显示给用户。)以下是代码:

-(IBAction)copyURLAction {
    if (webView) {
        NSString* htmlString = [webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.innerHTML"];
        if (htmlString) {
            NSString *youTubeID = @"data-youtube-id=\"";
            int position = [htmlString rangeOfString:youTubeID].location + [youTubeID length];
            if (position > 1) {
                htmlString = [htmlString substringFromIndex:position];
                position = [htmlString rangeOfString:@"\""].location;
                htmlString = [htmlString substringToIndex:position];
                NSString* tempPrefix = @"http://m.youtube.com/watch?v=";
                NSString *youTubeString = [tempPrefix stringByAppendingString:htmlString];
                textFieldView.text = youTubeString;
            } else {
                [[SharedObjectsSingleton sharedInstance] displayAlert:@"Can't Copy URL" :@"Can only copy the URL when a single video is being displayed."];
            }
        } else {
            [[SharedObjectsSingleton sharedInstance] displayAlert:@"Can't get URL" :@"Nothing to copy."];
        }
    }
}