public MenuListView(string str)
{
List <MenuItem> data = new MenuListData(str);
ItemsSource = data;
VerticalOptions = LayoutOptions.FillAndExpand;
BackgroundColor = Color.Transparent;
SeparatorVisibility = SeparatorVisibility.None;
var cell = new DataTemplate(typeof(MenuCell));
cell.SetBinding(MenuCell.TextProperty, "Title");
//cell.SetBinding (MenuCell.DetailProperty, "Des");
cell.SetBinding(MenuCell.ImageSourceProperty, "IconSource");
ItemTemplate = cell;
}
public void UpDate(string str)
{
List <MenuItem> data = new MenuListData(str);
Menu.ItemsSource = data;
}