Is there a way to change the volume of the device? I've seen several apps do it.
I have a desktop version of the iOS app and the device will be able to be controlled to some extent over the network. One of the things I want to allow the user to do is change the device volume and then play a sound. This can help if you loose your iPhone in a crack in your couch again, but can't find it.
Is there any way that you can do this without Apple getting angry?
Answer
Using iPodMusicPlayer would affect the actual iPod volume setting as well. If you want to avoid that, use this:
#import <MediaPlayer/MediaPlayer.h>
// ...
MPMusicPlayerController *musicPlayer = [MPMusicPlayerController applicationMusicPlayer];
musicPlayer.volume = 1.0f;
As the user holex correctly mentioned the property volume in MPMusicPlayerController is deprecated in iOS 7.