Detecting if music is playing?

Question

Hi! My app involves music(iPodMusic), and there is a UISwitch toggling play/pause. My goal is to be able to detect if music is playing, so that therefore the play/pause switch can say 'play' when music is playing and 'pause' if it isn't.

Answer 1

if ([[MPMusicPlayerController iPodMusicPlayer] playbackState] == MPMusicPlaybackStatePlaying) ...

Answer 2

If the music is from your own app, check AVAudioPlayer's playing property.

If the music is from iPod, check MPMusicPlayerController's nowPlayingItem or playbackState property.

Answer 3

MPMusicPlayerController is only available in OS 3.0 or above. If you're running 2.0 you're out of luck. Here's a code snippet that checks if you're running 3.0 or above and only then attempts to create an MPMuiscPlayerController

bool playerDetectedAndPlaying = false;
NSString *reqSysVer = @"3.0";
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending){
    Class MusicPlayerController = NSClassFromString(@"MPMusicPlayerController");
    if (MusicPlayerController){         
        id myMusicPlayerController = [[MusicPlayerController alloc]init];
        id MusicPlayer = [[myMusicPlayerController class] iPodMusicPlayer ];
        if ( [ MusicPlayer playbackState ] == MPMusicPlaybackStatePlaying ) {
            playerDetectedAndPlaying = true;
        }
    }
}

You have to compile against a 3.0 SDK, but if you set the deployment target to 2.0, this code still runs on older devices.