I need to make a photo app.
Will it be possible to assign some function, like controlling the light intensity or brightness to an iPhone\'s hardware volume control
I don't think this is really possible as we cannot change the in-built functionalities of the volume control of iPhone and for that matter any of the iOS devices and make it work as we want.
I think all this is not a part of Public API for iOS developers which we can modify and use it for other functions in our application. It is a part of Private API.
So as far as I know, it is not possible.
Hope this helps you.