如何在xamarin.forms中对选项卡式页面应用渐变颜色

using Xamarin.Forms;

namespace YourNamespace
{
    public class GradientBackground : View
    {
        public static readonly BindableProperty StartColorProperty =
            BindableProperty.Create(nameof(StartColor), typeof(Color), typeof(GradientBackground), Color.Default);

        public static readonly BindableProperty EndColorProperty =
            BindableProperty.Create(nameof(EndColor), typeof(Color), typeof(GradientBackground), Color.Default);

        public Color StartColor
        {
            get { return (Color)GetValue(StartColorProperty); }
            set { SetValue(StartColorProperty, value); }
        }

        public Color EndColor
        {
            get { return (Color)GetValue(EndColorProperty); }
            set { SetValue(EndColorProperty, value); }
        }
    }
}

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:YourNamespace"
             x:Class="YourNamespace.YourPage">
    <ContentPage.Resources>
        <ResourceDictionary>
            <local:GradientBackground x:Key="TabbedPageBackground"
                                      StartColor="#FF0000"
                                      EndColor="#0000FF" />
        </ResourceDictionary>
    </ContentPage.Resources>
    
    <Grid Background="{StaticResource TabbedPageBackground}">
        <!-- Your tabbed page content here -->
    </Grid>
</ContentPage>