如何在xamarin表单中进行xaml的动态设计

<!-- MainPage.xaml -->
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="DynamicDesign.MainPage">
    <StackLayout>
        <Label Text="{Binding Message}" />
        <Button Text="Change Message" Command="{Binding ChangeMessageCommand}" />
    </StackLayout>
</ContentPage>

// MainPage.xaml.cs
public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
        BindingContext = new MainViewModel();
    }
}

// MainViewModel.cs
public class MainViewModel : INotifyPropertyChanged
{
    private string _message;
    public string Message
    {
        get { return _message; }
        set
        {
            _message = value;
            OnPropertyChanged(nameof(Message));
        }
    }

    public ICommand ChangeMessageCommand { get; }

    public MainViewModel()
    {
        Message = "Hello, Xamarin.Forms!";
        ChangeMessageCommand = new Command(ChangeMessage);
    }

    private void ChangeMessage()
    {
        Message = "Message changed at " + DateTime.Now.ToString();
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}