Hi there! I understand you're having trouble with the Yuka app not scanning. Let's see if we can get that sorted out together.

First, could you tell me if you've recently changed any settings on your device? It would also be helpful to know if you’re receiving any specific error messages when you try to scan.

In the meantime, here are a few things you can check:

1. Camera Permissions: Make sure that the Yuka app has permission to access your camera. You can do this by going to your iPhone's Settings > Privacy > Camera, and then check if Yuka is allowed.

2. Network Connection: Ensure that you have a valid Wi-Fi or cellular connection. Sometimes a weak connection can affect the scanning feature.

3. App Updates: Check if you have the latest version of the Yuka app. You can do this by going to the App Store and searching for Yuka; if an update is available, you'll see an option to update.

4. Reopen the App: Try closing the Yuka app completely and then reopening it. This can often help reset any temporary issues.

5. Restart your Phone: A simple restart can sometimes fix minor glitches that may be causing the problem.

If you've tried any of these steps already, please let me know, and we can look into more advanced troubleshooting!