问Xamarin.Forms:软键盘重叠页面底部的最后一个条目(滚动时)

EN

<ContentPage.Content>
        <ScrollView>
                <StackLayout x:Name="StackLayoutButtons" HorizontalOptions="Center" Orientation="Horizontal">
                    <Button x:Name="PreviousButton" WidthRequest="35" FontSize="23" FontAttributes="Bold" Clicked="PreviousButton_OnClicked"></Button>
                    <Button x:Name="DatePickerButton" FontSize="20" Clicked="DatePickerButton_OnClicked"></Button>
                    <DatePicker x:Name="DatePicker" Format="dddd d MMMM yyyy" VerticalOptions="Center" HorizontalOptions="FillAndExpand" IsVisible="False" IsEnabled="False"/>
                    <Button x:Name="NextButton" WidthRequest="35" FontSize="23" FontAttributes="Bold" Clicked="NextButton_OnClicked"></Button>
                    <Button x:Name="LastButton" WidthRequest="50" FontSize="23" FontAttributes="Bold" Clicked="LastButton_OnClicked"></Button>
                </StackLayout>

                <ListView x:Name="ListViewItemPage" ItemTapped="ListView_OnItemTapped">
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <ViewCell>
                                <RelativeLayout x:Name="RelativeLayout" >
                                    <Label x:Name="DescriptionLabel" Text="{Binding Description}"  RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent, Property=Y, Factor=0, Constant=15}" RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToParent, Property=X, Factor=0, Constant=15}" />
                                    <Entry x:Name="Entry" WidthRequest="85" Keyboard="Text" HorizontalTextAlignment="Start" FontSize="19" HorizontalOptions="Center" VerticalOptions="Center" Text="{Binding Value, Mode=TwoWay, Converter={StaticResource FloatValueConverter}}" Unfocused="ValueEntry_OnUnfocused"
                                           RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent, Property=Y, Factor=0, Constant=10}" RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToParent, Property=Width, Factor=1, Constant={StaticResource ConstantMultiPlatform}}" >
                                        <Entry.HeightRequest>
                                            <OnPlatform x:TypeArguments="x:Double">
                                                <On Platform="iOS" Value="28"></On>
                                                <On Platform="Android" Value="42"></On>
                                                <On Platform="UWP" Value="32"></On>
                                            </OnPlatform>
                                        </Entry.HeightRequest>
                                    </Entry>
                                </RelativeLayout>
                            </ViewCell>
                        </DataTemplate>
                    </ListView.ItemTemplate>
                </ListView>
            </StackLayout>
        </ScrollView>
    </ContentPage.Content>