- (BOOL)isMuted  
{  
    CFStringRef route;  
    UInt32 routeSize = sizeof(CFStringRef);  

    OSStatus status = AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &routeSize, &route);  
    if (status == kAudioSessionNoError)  
    {  
        if (route == NULL || !CFStringGetLength(route))  
            return YES;  
    }  

    return NO;  
}

void SoundMuteNotificationCompletionProc(SystemSoundID  ssID,void* clientData){
    MMSoundSwitchDetector* detecotr = (__bridge MMSoundSwitchDetector*)clientData;
    [detecotr complete];
}

- (instancetype)init {
    self = [super init];   
     if (self) {
        NSURL *pathURL = [[NSBundle mainBundle] URLForResource:@"mute" withExtension:@"caf"];     
        if (AudioServicesCreateSystemSoundID((__bridge CFURLRef)pathURL, &_soundId) == kAudioServicesNoError){
            AudioServicesAddSystemSoundCompletion(self.soundId, CFRunLoopGetMain(), kCFRunLoopDefaultMode, SoundMuteNotificationCompletionProc,(__bridge void *)(self));
            UInt32 yes = 1;
            AudioServicesSetProperty(kAudioServicesPropertyIsUISound, sizeof(_soundId),&_soundId,sizeof(yes), &yes);
        } else {
            MMErrorWithModule(LOGMODULE, @"Create Sound Error.");
            _soundId = 0;
        }
    }    return self;
}

- (void)checkSoundSwitchStatus:(CheckSwitchStatusCompleteBlk)completHandler {   
         if (self.soundId == 0) {
        completHandler(YES);      
        return;
    }
    self.completeHandler = completHandler;
    self.beginTime = CACurrentMediaTime();
    AudioServicesPlaySystemSound(self.soundId);
}

- (void)complete {
    CFTimeInterval elapsed = CACurrentMediaTime() - self.beginTime;
    BOOL isSwitchOn = elapsed > 0.1;   
     if (self.completeHandler) {
        self.completeHandler(isSwitchOn);
    }
}

//This property is deprecated -- use MPVolumeView for volume control instead.mpc.volume = 0;  //0.0~1.0
MPMusicPlayerController *mpc = [MPMusicPlayerController applicationMusicPlayer];

- (void)setSystemVolume:(float)volume {
    UISlider* volumeViewSlider = nil;  
   for (UIView *view in [self.m_privateVoulmeView subviews]){     
      if ([view.class.description isEqualToString:@"MPVolumeSlider"]){
            volumeViewSlider = (UISlider*)view;        
               break;
        }
    }    if (volumeViewSlider != nil) {
        [volumeViewSlider setValue:volume animated:NO];        //通过send
        [volumeViewSlider sendActionsForControlEvents:UIControlEventTouchUpInside];
    }
}