.NET MAUI中iOS端RadioButton不显示（Android正常）求助

Android端RadioButton显示正常，但iOS端完全无法显示，尝试添加自定义ControlTemplate样式后仍无效果。

iOS端效果截图 #

布局代码 #

<StackLayout Padding="0,15,0,10" IsVisible="{Binding isShowRadioButton}">
    <StackLayout BindableLayout.ItemsSource="{Binding inspectionQuestionOption}">
        <BindableLayout.ItemTemplate>
            <DataTemplate>
                <StackLayout Orientation="Horizontal" RadioButtonGroup.GroupName="answersofradio">
                    <RadioButton IsChecked="{Binding IsChecked}" BackgroundColor="Transparent" GroupName="Numbers"/>
                    <Label Margin="5,0,0,0" Text="{Binding optionName}" TextColor="White"/>
                </StackLayout>
            </DataTemplate>
        </BindableLayout.ItemTemplate>
    </StackLayout>
</StackLayout>

自定义ControlTemplate代码 #

<ControlTemplate x:Key="RadioButtonTemplate">
    <Border Stroke="Transparent" BackgroundColor="Transparent">
        <VisualStateManager.VisualStateGroups>
            <VisualStateGroupList>
                <VisualStateGroup x:Name="CheckedStates">
                    <VisualState x:Name="Checked">
                        <VisualState.Setters>
                            <Setter TargetName="check" Property="Opacity" Value="1" />
                        </VisualState.Setters>
                    </VisualState>
                    <VisualState x:Name="Unchecked">
                        <VisualState.Setters>
                            <Setter TargetName="check" Property="Opacity" Value="0" />
                        </VisualState.Setters>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateGroupList>
        </VisualStateManager.VisualStateGroups>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="20" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
            <Grid WidthRequest="20" HeightRequest="20" Grid.Column="0" VerticalOptions="Center" HorizontalOptions="Center">
                <Ellipse x:Name="border_circle" StrokeThickness="2" Stroke="{TemplateBinding BorderColor}" Fill="White" WidthRequest="18" HeightRequest="18" HorizontalOptions="Center" VerticalOptions="Center" />
                <Ellipse x:Name="check" Fill="{TemplateBinding BorderColor}" WidthRequest="10" HeightRequest="10" HorizontalOptions="Center" VerticalOptions="Center" />
            </Grid>
            <ContentPresenter Margin="10,0,0,0" Grid.Column="1" HorizontalOptions="Start" VerticalOptions="Center" />
        </Grid>
    </Border>
</ControlTemplate>

恳请各位帮忙排查并解决该问题，提前感谢！

内容的提问来源于stack exchange，提问作者Vanjara Sweta