Xamarin表单-PullToRefreshLayout切断页面顶部

Question

我正在使用James Montemagno（https://github.com/jamesmontemagno/Xamarin.Forms-PullToRefreshLayout）的PullToRefreshLayout，并且在iOS平台上，当我的页面加载和IsRefreshing属性设置为false时，页面顶部被切除。

我该如何解决？

那是我的XAML布局？

    <pull:PullToRefreshLayout
                x:Name="RefreshLayout"
                IsPullToRefreshEnabled="True"
                RefreshCommand="{Binding RecarregarCommand}"
                IsRefreshing="{Binding IsBusy}">
                <customViews:AlwaysScrollView x:Name="Scroll"
                    VerticalOptions="FillAndExpand">
                    <StackLayout Spacing="{StaticResource CardSpacing}"
                                 Padding="0,30,0,16"
                                 HorizontalOptions="FillAndExpand"
                                 VerticalOptions="FillAndExpand">

                        <Image x:Name="ItemFoto"
                                Source="{Binding UrlLogoClinica}"
                                Aspect="AspectFit"
                                MinimumWidthRequest="150"
                                HeightRequest="150"
                                VerticalOptions="Start"
                                HorizontalOptions="FillAndExpand"
                                Margin="16,0,16,16">
                            <Image.GestureRecognizers>
                                <TapGestureRecognizer Command="{Binding DetalheClinicaCommand}"/>
                            </Image.GestureRecognizers>
                        </Image>

                        <customViews:TableViewSemScroll
                            Intent="Menu"
                            HeightRequest="100"
                            HasUnevenRows="True"
                            Margin="0"
                            VerticalOptions="Start"
                            HorizontalOptions="FillAndExpand">
                            <TableRoot>
                                <TableSection Title="{x:Static resx:AppResources.TituloPaciente}">
                                    <TextCell Text="{Binding Paciente.Nome}"
                                              StyleId="disclosure"
                                              Command="{Binding EditarCommand}"/>
                                </TableSection>
                            </TableRoot>
                        </customViews:TableViewSemScroll>

                        <customViews:CardView IsVisible="{Binding IsListaAgendaVisivel}"
                                              Margin="0">
                            <StackLayout Spacing="0">
                                <customViews:LabelSection Text="{x:Static resx:AppResources.TituloAgenda}"/>
                                <customViews:HeaderDivider/>
                                <customViews:ListViewSemScroll
                                    x:Name="ListAgenda"
                                    ItemsSource="{Binding ListaAgenda}"
                                    SeparatorColor="{StaticResource ListSeparator}"
                                    RowHeight="44">
                                    <customViews:ListViewSemScroll.Behaviors>
                                        <behaviors:EventToCommandBehavior 
                                        EventName="ItemTapped" 
                                        Command="{Binding ItemSelectCommand}" 
                                        EventArgsConverter="{StaticResource ItemToObject}"/>
                                    </customViews:ListViewSemScroll.Behaviors>
                                    <customViews:ListViewSemScroll.ItemTemplate>
                                        <DataTemplate>
                                            <ImageCell 
                                                ImageSource="{Binding NomeIcone}"
                                                Text="{Binding Nome}"
                                                StyleId="disclosure"/>
                                        </DataTemplate>
                                    </customViews:ListViewSemScroll.ItemTemplate>
                                </customViews:ListViewSemScroll>
                                <customViews:FooterDivider/>
                            </StackLayout>
                        </customViews:CardView>                           

//Other listviews

                    </StackLayout>
                </customViews:AlwaysScrollView>

            </pull:PullToRefreshLayout>

如您所见，我的页面中还有很多ListView，还有TableView，但同时禁用了TableView和ListViews滚动。