[Bug] [Regression] iOS Frame.Background not working

[albilaga]

Description

When setting Frame.Background, the background will set to white. But with BackgroundColor it is working as expected. This is only happened on iOS

Steps to Reproduce

1. Create sample page like this

ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:App1"
             BackgroundColor="Red"
             x:Class="App1.MainPage">

    <StackLayout VerticalOptions="Center" HorizontalOptions="Center">
        <Frame HasShadow="False">
            <Frame.Background>
                <SolidColorBrush Color="Transparent" />
            </Frame.Background>
            <Label Text="Hello" />
        </Frame>
    </StackLayout>

</ContentPage>

2. Run the app.

Expected Behavior

Frame Background should be Transparent.

Actual Behavior

Frame.Background is White

Basic Information

• Version with issue:
• Last known good version: 5.0.0.2012
• Platform Target Frameworks:
  • iOS: 14.5
• Issue with version: 5.0.0.2083
• Affected Devices: iOS only

Screenshots

Workaround

Use BackgroundColor Transparent instead of Background with SolidBrushColor Transparent

[thisisthekap]

@albilaga Thank you for providing the workaround!

[albilaga]

Possibly related with this PR #13401 ?

[DevEddy]

Same problem here. Can't go with the workaround cause i am using a gradient color with alpha. With this SR4 is currently unusable for us.

[thisisthekap]

@davidortinau As asked for in #14205: This is a regression.

[jfversluis]

@albilaga @thisisthekap and others, a PR is open for this now, would you be able to grab the NuGet from that as described here and let us know if this fixes this issue?

[DevEddy]

Hey @jfversluis, I can confirm that version 5.0.0.7409 fixes the issue, good job!

[jfversluis]

Perfect @DevEddy thanks! Did you by any chance also play around with it some more besides this issue? Just to make sure this doesn't cause any other unintended things :)

[DevEddy]

Hi @jfversluis, yeah, everything we use seems to work correctly. I didn't find any issues on iOS.

[jfversluis]

Great! I did some testing and seemed good too. Merged, should be part of the next service release!

Thanks for helping us test this!

[albilaga]

Yeah this is working @jfversluis . Thank you