/// <summary>
/// Exports the image as a PDF with the given file name.
/// </summary>
/// <param name="filename">Filename.</param>
public static void ExportAsPDF(this UIImage image, string filename, CGPDFInfo info, double horizRes = 96, double vertRes = 96)
{
var width = (double)image.Size.Width * (double)image.CurrentScale * 72 * horizRes;
var height = (double)image.Size.Height * (double)image.CurrentScale * 72 * vertRes;
var pdfFile = new NSMutableData();
pdfFile.Init();
var pdfConsumer = new CGDataConsumer(pdfFile);
var mediaBox = new CGRect(0, 0, width, height);
using (var context = new CGContextPDF(pdfConsumer, mediaBox, info)) {
context.BeginPage(new CGPDFPageInfo());
context.DrawImage(mediaBox, image.CGImage);
context.EndPage();
}
var attrs = new NSFileAttributes();
NSFileManager.DefaultManager.CreateFile(filename, pdfFile, attrs);
}