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Let the image occupy only the remaining space

I want the image to occupy the remaining space in StackLayout, however somehow this seems impossible in XAML. The image always tries to display itself with the maximum available size.

<StackLayout>
  <Image Source="{Binding ProfileImage}" Aspect="AspectFit" HorizontalOptions="Center" VerticalOptions="Start" />
  <StackLayout Orientation="Vertical" HorizontalOptions="Fill" VerticalOptions="EndAndExpand">
    <Button HorizontalOptions="FillAndExpand" VerticalOptions="End" x:Name="_ButtonShare" Text="Share" />
    <Button HorizontalOptions="FillAndExpand" VerticalOptions="End" x:Name="_ButtonExternalLinks" Text="External links"/>
  </StackLayout>
</StackLayout>

I tried different Vertical- and HorizontalOptions for this, but the second button is always squeezed out of the view. Using a certain height is also not the best solution.

It seems that this is possible with a relative layout, but that means I'm attached to relative values, which is not very good if I am targeting different devices (e.g. iPhone4S and iPhone5).

<RelativeLayout>
  <Image Source="{Binding ProfileImage}" Aspect="AspectFit"
         RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent, Property=Width, Factor=1}"
         RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToParent, Property=Height, Factor=0.7}"/>
  <StackLayout Orientation="Vertical"
         RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent, Property=Height, Factor=0.8}"
         RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent, Property=Width, Factor=1}"
         RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToParent, Property=Height, Factor=0.2}">
    <Button HorizontalOptions="FillAndExpand" VerticalOptions="End" x:Name="_ButtonShare" Text="Share" />
    <Button HorizontalOptions="FillAndExpand" VerticalOptions="End" x:Name="_ButtonExternalLinks" Text="External links"/>
  </StackLayout>
</RelativeLayout>

How can I do it right?

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1

, Grid.

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="1*"/>
            <ColumnDefinition Width="1*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="auto"/>
        </Grid.RowDefinitions>
        <Image Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2"  Source="{Binding ProfileImage}" Aspect="AspectFit" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" />
        <Button Grid.Row="1" Grid.Column="0" HorizontalOptions="FillAndExpand" VerticalOptions="End" x:Name="_ButtonShare" Text="Share" />
        <Button Grid.Row="1" Grid.Column="1" HorizontalOptions="FillAndExpand" VerticalOptions="End" x:Name="_ButtonExternalLinks" Text="External links"/>
    </Grid>
+5

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