How can i pass a QR code image to apple watch - ios

Question

I have a QR code image in the format xamarin.forms.image created using zxing.
My requirement is to show this QR code on apple watch. this image is saved to a global variable like below
stackQRCode.Children.Add(zXingBarcodeImageView);
App.QRCodeImage = zXingBarcodeImageView
I am trying with wcsessionmanager.But in the UpdateApplicationContext, the image is not getting sent.
anyone with solution? What is the simplest way to achieve this?Thanks in Advance.

Answer 1

The Easiest way to convert a Xamarin Forms Image into a UIImage and vice versa would be byte[] conversion:
UIImage to Byte[]:
byte[] byteArray;
using (NSData imageData = originalImage.AsJPEG())
{
byteArray = new Byte[imageData.Length];
System.Runtime.InteropServices.Marshal.Copy(imageData.Bytes, byteArray, 0, Convert.ToInt32(imageData.Length));
}
Byte[] to Xamarin.Forms.ImageSource:
var XamImageSource=ImageSource.FromStream(() => new MemoryStream
(byteArray));
Now the catch is the other way around Xamarin.Forms Image/ImageSource do not expose any API's to directly get the image stream or byte[] from it.(In my Knowledge)
So you can use FFImageLoading instead!!
Which has an API to get the RawImage as follows
FFImageLaoding to byte[]:
var bytes = await ImageView.GetImageAsJpgAsync(); //png method also available
byte[] to UIImage
var data = NSData.FromArray(byteData);
var uiimage = UIImage.LoadFromData(data);