How do I read photos off of an SD card?

To read photos off of an SD card, you can use the Photokit framework, which provides a robust set of APIs for accessing and managing photo and video assets on an iOS device. Here are some key points from the WWDC sessions that might help you:

1. Photokit Permissions: Ensure your app has the necessary permissions to access the photo library. If the device is locked, only photos and videos captured during the current session will be available. When the device is unlocked, your app can access all photos and videos that it has permissions for. For more details, you can refer to the session Build a great Lock Screen camera capture experience.

2. Reading Photos: You can use Photokit to programmatically fetch photos from the user's photo library. For example, you can filter and fetch spatial assets using the PHAsset class. This is discussed in the session Build compelling spatial photo and video experiences.

3. Handling HDR Images: If you are working with HDR images, you can use the CIImage class to read the image into memory. You can initialize a CIImage object with a URL or data. For HDR images, you can use the expand HDR option to load the image as HDR. This is covered in the session Use HDR for dynamic image experiences in your app.

Relevant Sessions

1. Build a great Lock Screen camera capture experience
2. Build compelling spatial photo and video experiences
3. Use HDR for dynamic image experiences in your app

If you need more specific details or code examples, you might want to watch the full sessions mentioned above.