extensionContext
Asked on 06/18/2025
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The concept of "extensionContext" is related to app extensions, which allow you to extend custom functionality and content beyond your app. In the session titled "Build a great Lock Screen camera capture experience" from WWDC 2024, it is mentioned that an app context is shared between your application and extension. This context can be used to store user preferences or settings that you want to share between your capture experience and your extension.
For example, you might store data to represent app purchases made by a person in your application, so they can also be used in your capture extension. To update the app context, you would call the update appcontext function, passing in the new app context you wish to persist. However, it's important to note that the app context has a limited size, and if it is too large, it will not be persisted, which may impact the behavior of your capture experience.
For more details, you can refer to the session Build a great Lock Screen camera capture experience (15:33).
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