I’m trying to add a tag/copyright of some kind to UIImages created in my app so that if they are saved to the camera roll/photos library and then later imported (even if the app is deleted & re-installed), it can be detected.

I have tried the following code however I simply continue to get “No copyright information found”.

This code is used for saving the image:

func saveImageWithMetadata(_ image: UIImage, completion: @escaping (Bool) -> Void) {

    let metadata: [String: Any] = [
        kCGImagePropertyIPTCCopyrightNotice as String: "Copyright Company Name"
    ]
    
    guard let imageData = image.pngData() else {
        completion(false)
        return
    }
    
    guard let imageSource = CGImageSourceCreateWithData(imageData as CFData, nil) else {
        completion(false)
        return
    }
    
    let newImageData = NSMutableData()
    
    guard let imageDestination = CGImageDestinationCreateWithData(newImageData, kUTTypePNG, 1, nil) else {
        completion(false)
        return
    }
    
    CGImageDestinationAddImageFromSource(imageDestination, imageSource, 0, metadata as CFDictionary)
    
    if !CGImageDestinationFinalize(imageDestination) {
        completion(false)
        return
    }
    
    PHPhotoLibrary.shared().performChanges({
        let options = PHAssetResourceCreationOptions()
        PHAssetCreationRequest.forAsset().addResource(with: .photo, data: newImageData as Data, options: options)
    }) { (success, error) in
        completion(success && error == nil)
    }
}

And this is the importing code:

 func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
       picker.dismiss(animated: true, completion: nil)
       

       if let imageUrl = info[.imageURL] as? URL {
           guard let imageSource = CGImageSourceCreateWithURL(imageUrl as CFURL, nil) else {
               print("Unable to create image source.")
               return
           }
           
           if let metadata = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil) as? [String: Any] {
               if let iptcMetadata = metadata[kCGImagePropertyIPTCDictionary as String] as? [String: Any],
                  let copyright = iptcMetadata[kCGImagePropertyIPTCCopyrightNotice as String] as? String {
                   print("Image has copyright information: (copyright)")
               } else {
                   print("No copyright information found.")
               }
           }
       }
       
       
   }

I’ve been doing my head in looking around for a straightforward solution to this, and have not been able to find up to date relevant answers to this issue.