有没有办法在xamarin表单上逐页添加导航栏上的背景图片

public class CustomNavigationPage : Xamarin.Forms.NavigationPage
{
    public CustomNavigationPage(Page root) : base(root)
    {
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();

        // 设置导航栏的背景图片
        NavigationPage.SetTitleView(this, CreateBackgroundImage());
    }

    private View CreateBackgroundImage()
    {
        // 创建一个包含背景图片的视图
        var backgroundImage = new Image
        {
            Source = "background_image.png", // 替换为你的背景图片路径
            Aspect = Aspect.AspectFill,
            HorizontalOptions = LayoutOptions.Fill,
            VerticalOptions = LayoutOptions.Fill
        };

        // 创建一个包含背景图片的容器
        var container = new AbsoluteLayout();
        AbsoluteLayout.SetLayoutBounds(backgroundImage, new Rectangle(0, 0, 1, 1));
        AbsoluteLayout.SetLayoutFlags(backgroundImage, AbsoluteLayoutFlags.All);
        container.Children.Add(backgroundImage);

        return container;
    }
}

public partial class App : Application
{
    public App()
    {
        InitializeComponent();

        MainPage = new CustomNavigationPage(new MainPage()); // 替换为你的主页
    }
}