WKWebView causes my view controller to leak

Question

My view controller displays a WKWebView. I installed a message handler, a cool Web Kit feature that allows my code to be notified from inside the web page:

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Answer 1

The leak is caused by userContentController.addScriptMessageHandler(self, name: "handlerName") which will keep a reference to the message handler self.

To prevent leaks, simply remove the message handler via userContentController.removeScriptMessageHandlerForName("handlerName") when you no longer need it. If you add the addScriptMessageHandler at viewDidAppear, its a good idea to remove it in viewDidDisappear.