vision-imagepicker_result.swift

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) -> Void
{
    // 1
    guard let image = info[UIImagePickerControllerOriginalImage] as? UIImage, 
            let ciImage = image.ciImage 
    else
    {
        return
    }

    // 2
    let imageRequest = VNImageRequestHandler(ciImage: ciImage)

    // 3
    do 
    {
        try imageRequest.perform([ self.requestText ])    
    } 
    catch error 
    {
        print("No podemos procesar la imagen del Carrete de Fotos. \(error.localizedDescription)")
    }
}