Video thumbnail image moving for inset image using jwplayer video embedded Html content in web view from navigate in swift

Question

I am using html content for uiwebview in swift but going to one view controller to another controller navigate suddenly moving inner video image.i tried to clear web view- refer link How To Clear A UIWebView and
also used autoresizing autoresizingMask = .flexibleWidth but didn't solved.Clear web view cache using in viewDiddisappear cann't get solution[

Swift 3.0 code:

let htmlString:String = descriptionHtml

 webView.loadHTMLString(htmlString, baseURL: nil)

 webView.scrollView.isScrollEnabled = false

 webView.allowsInlineMediaPlayback = true

let aStr = String(format: "%@%x", "document.querySelector('meta[name=viewport]').setAttribute('content', 'width=%d;', false); ", webView.frame.size.width)

 webView.stringByEvaluatingJavaScript(from: aStr) 

 webView.delegate = self

I would appreciate if someone could help.