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I’ve recently downloaded an app that uses the ‘Volume -‘ button to toggle a value, and it uses the ‘Volume +’ button to start/stop recording of video. The app is called SloPro, and can be found in the app store. I thought it wasn’t allowed to modify the behaviour of the iPhone’s hardware. Any ideas on how this is done?
See the Audio Session Services References for more details, but basically you start an audio session with
AudioSessionInitialize. Then you make it active withAudioSessionSetActive. Then listen for changes in the volume withAudioSessionAddPropertyListenerwhere you can pass a callback that has typeAudioSessionPropertyListener.Check the following website out for an example:
http://fredandrandall.com/blog/2011/11/18/taking-control-of-the-volume-buttons-on-ios-like-camera/