How to adjust my listview in ios Xamarin forms - xamarin

Question

I have a problem in my ListView on iOS. I can't adjust it to all iOS templates, ex: put HeightRequest = "855" on my iPhone 7 it already fits correctly, else on the iPhone 5 and smaller my ListView from a scrow. so I want my ListView to automatically adjust to the screen size.
<ListView x:Name="listView"
CachingStrategy="RecycleElement"
ItemsSource="{Binding FeedItems}"
HasUnevenRows="True"
AbsoluteLayout.LayoutFlags="All"
AbsoluteLayout.LayoutBounds="0,0,1,1" HeightRequest="855">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid Padding="5">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="70"/>
<ColumnDefinition Width="5"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<StackLayout HeightRequest = "60" WidthRequest="60">
<Image x:Name="Image" Source="{Binding Image}" Scale="1.0" Aspect="AspectFill" VerticalOptions="FillAndExpand"/>
</StackLayout>
<StackLayout Grid.Column="2" Spacing="4" VerticalOptions="Center">
<Label Text="{Binding Category}" TextColor="White" FontSize="Small" LineBreakMode="NoWrap" BackgroundColor="{Binding Color_category}"/>
<Label Text="{Binding PublishDate}" TextColor="#666666" FontSize="Small" LineBreakMode="NoWrap"/>
<Label Text="{Binding Title}" TextColor="#234084" Font="Bold" FontSize="Small" LineBreakMode="WordWrap"/>
</StackLayout>
</Grid>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>

Answer 1

To expand a little more.
HeightRequest is used when you want to define a fixed size to an element. Xamarin will make its best to fulfill with this. In the other hand when you want your size to be relative you use the VerticalOptions and HorizontalOptions. This two properties will take a LayoutOptions struct and the default value for this is Fill (without expand).
This struct has two sets of properties, the ones I call "regular"
Center
Start
End
Fll
And the ones that "expands"
CenterAndExpand
StartAndExpand
EndAndExpand
FillAndExpand
You can read more about these here.
This last one FillAndExpand will take all the available space in the orientation it's used. This is the one you should use in your ListView to make it as big as the screen
Hope this helps.-