Stop video in UIWebView

Question

In my iPad App I have a modal view (UIViewController with modal presentation style UIModalPresentationPageSheet)

Inside the view is a UIWeb

Answer 1

Swift 4

//  Halt anything in progress
(contentViewController as! WebViewController).webView.loadHTMLString("Yoink://", baseURL: nil)

needed in a windowController's windowShouldClose() method when I close a window