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The iOS custom renderer to enable zooming of the PDF file
using pdfjs.Controls;
using pdfjs.iOS.CustomRenderers;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
[assembly: ExportRenderer(typeof(PdfWebView), typeof(PdfWebViewRenderer))]
namespace pdfjs.iOS.CustomRenderers
public class PdfWebViewRenderer : WebViewRenderer
protected override void OnElementChanged(VisualElementChangedEventArgs e)
if (NativeView != null && e.NewElement != null)
var pdfControl = NativeView as UIWebView;
if (pdfControl == null)
pdfControl.ScalesPageToFit = true;
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