如何打印Xamarin form跨平台应用的当前UI

Install-Package Xamarin.Forms.Printing

using Xamarin.Forms;
using Xamarin.Forms.PlatformConfiguration.iOSSpecific;

public class PrintService
{
    public async Task PrintCurrentPage()
    {
        var page = Application.Current.MainPage;
        var renderer = Platform.GetRenderer(page);
        var nativeView = renderer.NativeView;

        // Convert the page to an image
        var screenshot = await page.CaptureAsync();

        // Print the image
        await PrintImage(screenshot);
    }

    private async Task PrintImage(UIImage image)
    {
        var printController = UIPrintInteractionController.SharedPrintController;
        if (printController == null)
            return;

        var printInfo = new UIPrintInfo(UIPrintInfoEncoding.UTF8);
        printInfo.JobName = "Xamarin.Forms Print Job";
        printInfo.OutputType = UIPrintInfoOutputType.General;

        printController.PrintInfo = printInfo;
        printController.PrintingItem = image;

        await Task.Run(() => printController.Present(true, (handler, completed, error) =>
        {
            if (!completed && error != null)
            {
                // Handle error
            }
        }));
    }
}

public class MainPage : ContentPage
{
    private readonly PrintService _printService;

    public MainPage()
    {
        _printService = new PrintService();

        var printButton = new Button { Text = "Print" };
        printButton.Clicked += async (sender, e) => await _printService.PrintCurrentPage();

        Content = new StackLayout
        {
            Children = { printButton }
        };
    }
}