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I have asked this question before, but have not received any real answer. How do iPhone developers, such as the developer of the Camera+ app, detect when the volume buttons are pressed and how do they prevent the system volume change. Please do not just link to an old answer unless it uses a way that is currently App Store safe. If anyone knows, help is greatly appreciated. Thank you!
There is no App Store safe way to do it except to use the framework camera controls. When you use the standard controls, you get the volume controls for free. The reviewer may or may not let you go if you do it some other way, but officially you will be rejected unless you use the standard framework camera controls.