BoxView not visible in iOS - ios

Question

I created the following BoxView in my App.xaml (as a separator)...
<Style x:Key="BoxViewGray" TargetType="BoxView">
<Setter Property="HeightRequest" Value="0.2"/>
<Setter Property="Color" Value="Gray"/>
</Style>
...and use it like so in my Page:
<BoxView Style="{StaticResource BoxViewGray}" />
Straight forward and it works out quite fine with Android (Release & Debug) though when I debug the iOS Solution, it's not visible. Maybe as an additional info: I don't have a physical Mac for debugging but use Macincloud instead of. Don't have a physical device (iPhone etc) either.
Update: The complete XAML code of the page:
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:vm="clr-namespace:ErzengelMichael.ViewModels"
x:Class="ErzengelMichael.Views.EinstellungenPage"
Title="{Binding Rosenkranz[0].TabBarTitleSettings}" >
<ContentPage.BindingContext>
<vm:RosenkranzViewModel />
</ContentPage.BindingContext>
<ContentPage.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Offset="0.1" Color="Purple" />
<GradientStop Offset="0.9" Color="DarkSlateBlue" />
</LinearGradientBrush>
</ContentPage.Background>
<ScrollView>
<StackLayout Padding="10" >
<StackLayout Padding="5">
<BoxView Style="{StaticResource BoxViewGray}" />
<Label Text="{Binding Rosenkranz[0].SettingsText}"
HorizontalOptions="Center" FontSize="24" TextColor="White"
BackgroundColor="Transparent" Margin="0,0,0,5" />
<BoxView Style="{StaticResource BoxViewGray}" />
</StackLayout>
<StackLayout Orientation="Vertical" Padding="10" >
<StackLayout HorizontalOptions="Center" Orientation="Horizontal" Spacing="20" Padding="10">
<ImageButton CornerRadius="10" HeightRequest="80" BackgroundColor="Transparent" CommandParameter="French"
Command="{Binding ChangeLanguageCommand}" Source="france.jpg" VerticalOptions="Center" />
<ImageButton CornerRadius="10" HeightRequest="80" BackgroundColor="Transparent" CommandParameter="German"
Command="{Binding ChangeLanguageCommand}" Source="germany.jpg" VerticalOptions="Center" />
</StackLayout>
<StackLayout HorizontalOptions="Center" Orientation="Horizontal" Spacing="20" Padding="10" >
<ImageButton CornerRadius="10" HeightRequest="80" BackgroundColor="Transparent"
CommandParameter="English" Command="{Binding ChangeLanguageCommand}" Source="usa.jpg" VerticalOptions="Center" />
<ImageButton CornerRadius="10" HeightRequest="80" BackgroundColor="Transparent" CommandParameter="Spanish"
Command="{Binding ChangeLanguageCommand}" Source="spain.jpg" VerticalOptions="Center" />
</StackLayout>
<StackLayout HorizontalOptions="Center" Orientation="Horizontal" Spacing="20" Padding="10" >
<ImageButton CornerRadius="10" HeightRequest="80" BackgroundColor="Transparent" CommandParameter="Italian"
Command="{Binding ChangeLanguageCommand}" Source="italy.jpg" VerticalOptions="Center" />
<ImageButton CornerRadius="10" HeightRequest="80" BackgroundColor="Transparent" CommandParameter="Portugese"
Command="{Binding ChangeLanguageCommand}" Source="portugal.jpg" VerticalOptions="Center" />
</StackLayout>
</StackLayout>
<!--#region IMPRESSUM -->
<StackLayout Spacing="15" Padding="10" HorizontalOptions="Center" VerticalOptions="Center">
<BoxView Style="{StaticResource BoxViewGray}"/>
<Label HorizontalOptions="Center" HorizontalTextAlignment="Center" Text="Development and Design by xxx#web.de" TextColor="White" />
<Label HorizontalOptions="Center" Text="Version 1.0" TextColor="White" FontAttributes="Italic"/>
<Label HorizontalOptions="Center" TextColor="White" HorizontalTextAlignment="Center"
Text="Images used in this App are in the public domain worldwide."/>
<StackLayout Orientation="Horizontal" Spacing="0" HorizontalOptions="Center" >
<Label HorizontalTextAlignment="Center" >
<Label.FormattedText>
<FormattedString>
<Span Text="" FontFamily="FA-B" TextColor="White" CharacterSpacing="20" FontSize="24" />
<Span Text="" FontFamily="FA-B" TextColor="White" FontSize="24" />
</FormattedString>
</Label.FormattedText>
</Label>
</StackLayout>
<BoxView Style="{StaticResource BoxViewGray}" />
</StackLayout>
<!--#endregion-->
</StackLayout>
</ScrollView>
</ContentPage>

Answer 1

That because you set the HeightRequest as 0.2(which is less than 0.5) . So in iOS it will been ignored on some device because of screen resolution .
So you would better set it as 0.5 or higher on iOS device .
<Style x:Key="BoxViewGray" TargetType="BoxView">
<Setter Property="HeightRequest">
<Setter.Value>
<OnPlatform iOS="0.5" Android="0.2" />
</Setter.Value>
</Setter>
<Setter Property="Color" Value="Gray"/>
</Style>