Swift UIWebView detect scroll

Question

I have a UIWebView where I'm rendering a PDF. I need a method that hide the GUI if the pdf is not at the beginning of the page and show it again if the WebView hit the top. How can I check this?

Answer 1

You can use scrollViewDelegate method scrollViewDidScroll for that like this way.

func scrollViewDidScroll(scrollView: UIScrollView) {

    if (scrollView.contentOffset.y == 0) {
        //Do what you want.
    }
}

Note: Don't forgot to set scrollView delegate of webView like this self.webView.scrollView.delegate = self