ShareExtension - ShareViewController part 2

ShareViewController.swift

private func handleSharedFile() {
  // extracting the path to the URL that is being shared
  let attachments = (self.extensionContext?.inputItems.first as? NSExtensionItem)?.attachments ?? []
  let contentType = kUTTypeData as String
  for provider in attachments {
    // Check if the content type is the same as we expected
    if provider.hasItemConformingToTypeIdentifier(contentType) {
      provider.loadItem(forTypeIdentifier: contentType,
                        options: nil) { [unowned self] (data, error) in
      // Handle the error here if you want
      guard error == nil else { return }
           
      if let url = data as? URL,
         let imageData = try? Data(contentsOf: url) {
           self.save(imageData, key: "imageData", value: imageData)
      } else {
        // Handle this situation as you prefer
        fatalError("Impossible to save image")
      }
    }}
  }
}
  
private func save(_ data: Data, key: String, value: Any) {
  // You must use the userdefaults of an app group, otherwise the main app don't have access to it.
  let userDefaults = UserDefaults(suiteName: appGroupName)
  userDefaults.set(data, forKey: key)
}