How to code an app to be accessible on a locked iPhone?

Is it possible (codeable) to have an app accessible from a locked (unjailbroken) iPhone? Currently the camera is accessible in this way, but could an additional app add another in the same way?

If you are signed up as an iOS developer and have XCode installed, yes. You can code an app and run it on a regular (locked) iPhone. Putting an app on the app store is a different process.

https://developer.apple.com/...grams/ios/

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