Xamarin.Forms SignaturePadView inside Frame not working on UWP

[jBijsterboschNL]

When I put a SignaturePadView inside a Frame, I'm unable to draw on the SignaturePadView. At least on UWP, I've also tested it on Android and that does work. When removing the Frame it also works on UWP.

Xaml code:

<Grid HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" Padding="10">
  <Grid.ColumnDefinitions>
    <ColumnDefinition Width="*" />
  </Grid.ColumnDefinitions>
  <Grid.RowDefinitions>
    <RowDefinition Height="*"/>
  </Grid.RowDefinitions>

  <Image Source="{Binding PhotoPath}" Aspect="AspectFit" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" />
                
  <sig:SignaturePadView BackgroundColor="Transparent" ClearText="Clear" ClearTextColor="{StaticResource Black}" CaptionText="" SignatureLineColor="Transparent" StrokeColor="Red" StrokeWidth="2" />
</Grid>

[bruzkovsky]

I can confirm this when changing the SignatureXamlView.xaml from the samples to the following, I can no longer draw on the pad:

<?xml version="1.0" encoding="utf-8"?>

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:signature="clr-namespace:SignaturePad.Forms;assembly=SignaturePad.Forms"
             x:Class="Samples.Views.SignatureXamlView"
             Title="XAML Code-Behind" Padding="10,10,10,5">
    <StackLayout>
        <Frame>
            <signature:SignaturePadView x:Name="padView"
                                        HeightRequest="150" WidthRequest="240"
                                        BackgroundColor="White"
                                        CaptionText="Caption This" CaptionTextColor="Black"
                                        ClearText="Clear Me!" ClearTextColor="Red"
                                        PromptText="Prompt Here" PromptTextColor="Red"
                                        SignatureLineColor="Aqua" StrokeColor="Black" StrokeWidth="2" />
        </Frame>
        <Button Clicked="OnChangeTheme" Text="Change Theme" />
        <Button Clicked="OnGetStats" Text="Get Signature Stats" />
        <Button Clicked="OnGetImage" Text="Get Signature Image" />
    </StackLayout>
</ContentPage>

Edit:

This is most likely an upstream bug in Xamarin.Forms.

Workaround:

<Frame InputTransparent="True">
<!-- ... -->
</Frame>

[mattleibow]

Thanks for reporting this. I have filed a bug with Xamarin.Forms: xamarin/Xamarin.Forms#2748

[Craigleader]

I am having the same problem, my problem is that I have three frames in the view, if I add InputTransparent="True" it disabled the other input elements on the page. Are there any other workarounds for this issue?