How create Bottom sheets in Xamarin.Forms

Use SlideOverKit for this purpose.

It's available on nuget

Here are some examples

The control you are looking for is called Slide up Menu

Xamarin Forms Bottom sheet without a nuget package library.

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="YourAppName.Views.YourPageName">
  <ContentPage.Content>
    <RelativeLayout BackgroundColor="White">
      <StackLayout HorizontalOptions="Fill" VerticalOptions="Fill">
         <!-- place your page content here -->
      </StackLayout>

      <Frame x:Name="BottomSheet" CornerRadius="20" HasShadow="True" BackgroundColor="White" Padding="10,5" BorderColor="LightGray"
               RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToParent,Property=Height,Factor=.93,Constant=0}"
               RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToParent,Property=Width,Factor=1,Constant=0}"
               RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToParent,Property=Height,Factor=1,Constant=0}">
        <Frame.GestureRecognizers>
           <PanGestureRecognizer PanUpdated="OnPanelUpdated" />
        </Frame.GestureRecognizers>
        <StackLayout VerticalOptions="StartAndExpand" HorizontalOptions="Fill">
          <BoxView HeightRequest="5" CornerRadius="2" BackgroundColor="Grey" HorizontalOptions="CenterAndExpand" WidthRequest="50" Margin="25,10,0,10"></BoxView>
                   <!-- Place your bottom sheet layout here -->
        </StackLayout>
      </Frame>
    </RelativeLayout>
  </ContentPage.Content>
</ContentPage>

YourPageName.xaml.cs Code behind

 protected override void OnAppearing()
 {
    MoveBottomSheet(true);
 }

 /// The -negative value determines how many vertical units should the panel occuply on the screen.
 private async void MoveBottomSheet(bool close)
 {
    double finalTranslation = close ? (Device.Idiom == TargetIdiom.Phone ? -134.0 : -144.0) : (Device.Idiom == TargetIdiom.Phone ? -389.0 : -434.0);
    await BottomSheet.TranslateTo(BottomSheet.X, finalTranslation, 450, Easing.SinIn);
 }

/// This is fired multiple times while the user pans the bottom sheet. This variable captures the first intention of determining whether to open (pan up) or close (pan down)
bool _panelActivated = false;
private void OnPanelUpdated(object sender, PanUpdatedEventArgs e)
{
   switch (e.StatusType)
   {
      case GestureStatus.Started:
           break;
      case GestureStatus.Running:
           if (_panelActivated)
           {
              return;
           }
           MoveBottomSheet(e.TotalY > 0);               
           _panelActivated = true;
           break;
      case GestureStatus.Completed:
           _panelActivated = false;
           break;
      case GestureStatus.Canceled:
           break;
   }
}

you can use a nuget made by me this is the github project

https://github.com/josco007/CHDBottomSheet

It also supports scrollviews inside.

You need a relative layout as root view and set your relative layout in this way on the onAppearing method

protected override void OnAppearing()
{
    base.OnAppearing();
    CHDBottomSheetBs.SetRelativeLayout(_rootRlt);
}

See the github project for more information.