protected override async void OnAppearing()
{
base.OnAppearing();
int.TryParse(CoffeeId, out var result);
BindingContext = await CoffeeService.GetCoffee(result);
}
async Task Refresh()
{
IsBusy = true;
await Task.Delay(2000);
Coffee.Clear();
var coffees = await CoffeeService.GetCoffee();
Coffee.AddRange(coffees);
IsBusy = false;
}