iOS 100%width youtube vide embed

VideoVC.m

- (void)viewDidLoad {
    [super viewDidLoad];
  
    self.mWebView.delegate = self;
    [self.mWebView loadHTMLString:self.video.videoIframe baseURL:nil];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSString *css = @".container {position: relative; width: 100%; height: 0; padding-bottom: 56.25%;}.video {position: absolute; top: 0; left: 0; width: 100%; height: 100%;}  ";
    NSString* js = [NSString stringWithFormat:
                    @"var styleNode = document.createElement('style');\n"
                    "styleNode.type = \"text/css\";\n"
                    "var styleText = document.createTextNode('%@');\n"
                    "styleNode.appendChild(styleText);\n"
                    "document.getElementsByTagName('head')[0].appendChild(styleNode);\n",css];
    NSLog(@"js:\n%@",js);
    [self.mWebView stringByEvaluatingJavaScriptFromString:js];
}