Xamarin WebView iOS detect Scrolling event

Question

Setup: I'm using Xamarin (and Xamarin.Forms) developing an app with an embedded browser.

My issue: I have a WebView and I'm trying to detect when a user is scrolling, and whether it is Up or Down.

So far, I have created a Custom WebViewRenderer for the iOS-project. But how does one subscribe to scrolling events? Googling makes me believe that overriding the WebViewRenderer's

OnElementChanged(VisualElementChangedEventArgs e)

should be the right way, but I can't seem to find any documentation/leads on how to go further. Does anyone know, or can point me in the right direction?

check this webviewrendenrer. github.com/xamarin/Xamarin.Forms/blob/master/… and this example in android always the android code is very similar of iOS you can replicate the same code. forums.xamarin.com/discussion/54365/… — Marcos José Pérez Pérez
– Marcos José Pérez Pérez, Commented Oct 24, 2017 at 19:06

SushiHangover · Accepted Answer · 2017-10-25 06:15:57Z

3

Both MKWebView and UIWebView contain a UIScrollView that you can assign a UIScrollViewDelegate to its ScrollView.Delegate property and track scrollViewDidScroll to determine the panning direction:

public class UIScrollViewDelegate : NSObject, IUIScrollViewDelegate
{
    [Export("scrollViewDidScroll:")]
    public void Scrolled(UIScrollView scrollView)
    {
        var translation = scrollView.PanGestureRecognizer.TranslationInView(scrollView.Superview);
        Console.WriteLine($"Scrolling {(translation.Y > 0 ? "Down" : "Up")}");
    }
}

answered Oct 25, 2017 at 6:15

SushiHangover

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