var customerFeeling = await CustomerFeelingSheet.ShowRatingDialogAsync(parentVC);
switch(customerFeeling) {
  case CustomerFeeling.LikeIt:
    // "I like it!" was chosen 
    break;
  case CustomerFeeling.CouldBeBetter:
    // "It could be better..." was chosen
    break;
  default:
    // "Cancel" was chosen
    return;
}