void audioRouteChangeListenerCallback (

void *inUserData, AudioSessionPropertyID inID, UInt32 inDataSize, const void *inData) { UInt32 propertySize = sizeof(CFStringRef); AudioSessionInitialize(NULL, NULL, NULL, NULL); CFStringRef state = nil; AudioSessionGetProperty(kAudioSessionProperty_AudioRoute ,&propertySize,&state);

NSLog(@"%@",(NSString *)state);//return @"Headphone" or @"Speaker" and so on.

} - (void)viewDidLoad { [super viewDidLoad];

AudioSessionInitialize (NULL, NULL, NULL, NULL);

OSStatus status = AudioSessionAddPropertyListener( kAudioSessionProperty_AudioRouteChange, audioRouteChangeListenerCallback,self); //if(status == 0){//ok;} }