如何使用Xamarin渐变填充系统状态栏

<ContentPage ...
             xmlns:local="clr-namespace:YourNamespace"
             xmlns:sys="clr-namespace:System;assembly=mscorlib"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             BackgroundColor="Transparent">

    <ContentPage.Resources>
        <local:GradientColorConverter x:Key="GradientColorConverter" />
    </ContentPage.Resources>

    <ContentPage.Content>
        <StackLayout>
            <StackLayout.Background>
                <LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
                    <GradientStop Color="{Binding Source={x:Reference Name=Page}, 
                                        Path=BindingContext.StartColor,
                                        Converter={StaticResource GradientColorConverter}}" 
                                  Offset="0" />
                    <GradientStop Color="{Binding Source={x:Reference Name=Page}, 
                                        Path=BindingContext.EndColor,
                                        Converter={StaticResource GradientColorConverter}}" 
                                  Offset="1" />
                </LinearGradientBrush>
            </StackLayout.Background>
            
            <!-- Your content here -->
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

using System;
using Xamarin.Forms;

namespace YourNamespace
{
    public class GradientColorConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is string colorString)
            {
                return Color.FromHex(colorString);
            }
            return Color.Transparent;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

using Xamarin.Forms;

namespace YourNamespace
{
    public partial class YourPage : ContentPage
    {
        public static readonly BindableProperty StartColorProperty =
            BindableProperty.Create(nameof(StartColor), typeof(string), typeof(YourPage), "FF0000");

        public static readonly BindableProperty EndColorProperty =
            BindableProperty.Create(nameof(EndColor), typeof(string), typeof(YourPage), "0000FF");

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

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

        public YourPage()
        {
            InitializeComponent();
        }
    }
}

MainPage = new NavigationPage(new YourPage());