public static async Task<ImageSource> AddText(this StreamImageSource source, string text, PointF point, Font font, Color color) { var token = new CancellationTokenSource(); var stream = await source.Stream(token.Token); var image = UIImage.LoadFromData(NSData.FromStream(stream)); var bytes = image.AddText(text, point, font.ToUIFont(), color.ToUIColor()).AsPNG().ToArray(); return ImageSource.FromStream(new Func<Stream>(() => new MemoryStream(bytes))); }