Overriding iOS system volume to play alarm

I have an alarm application and if user reduces the phone volume using the hardware keys the alarm volume also gets affected. I have noticed few of the other alarm applications raising alarm ev开发者_运维技巧en if system volume is zero or muted. How i can achieve the same? iam currently using both AVAudioPlayer & MPMusicPlayerController for playing audio.

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You can set volume on both MPMusicPlayerController and on AVAudioPlayer.

For example:

MPMusicPlayerController *musicPlayer = [MPMusicPlayerController applicationMusicPlayer];
musicPlayer.volume = 1.0;