Pull to refresh not working in iOS WebView
<p>I've implemented a straight forward <code>WKWebView</code> in iOS.</p>

<pre><code>   var refreshControl = UIRefreshControl()
    refreshControl.addTarget(self, action: Selector("refreshWebView"), forControlEvents: UIControlEvents.ValueChanged)
</code></pre>

<p>This is in <code>viewDidLoad()</code></p>

<p>And the corresponding <code>refreshWebView</code> function. But when I run it on mobile or simulator, no matter how much I drag, there is no pull to refresh action. Nothing is triggered, and it almost feels like I am stuck to the upper bounds of the screen. Where can be going wrong?</p>