If you're encountering the issue where the photoLibraryDidChange method is being called multiple times in Swift, you might want to investigate the following:

  1. Check if you have multiple observers registered for the PHPhotoLibrary notifications. Having multiple observers can lead to the method being called multiple times.
  2. Review your code to see if there are any places where you might be inadvertently triggering changes to the photo library, causing the method to be called multiple times.
  3. Ensure that you are properly removing observers when they are no longer needed. Failure to remove observers can result in the method being called multiple times even after the observer is deallocated.
  4. If you're using multiple threads or queues, make sure that the method is being called only on the main thread. Dispatch any changes to the photo library to the main thread if necessary.
  5. Consider adding logging or debugging statements to track when and why the method is being called multiple times. This can help pinpoint the root cause of the issue.
  6. If the issue persists, try restarting your app or device to see if it's a temporary glitch.