iOS判断是否静音状态

CFStringRef state = nil;

   UInt32 propertySize = sizeof(CFStringRef);

    AudioSessionInitialize(NULL,NULL, NULL, NULL);

    OSStatus status =AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &propertySize, &state);

    

    if (status ==kAudioSessionNoError)

    {

       return (CFStringGetLength(state) ==0);   // YES = silent

    }

    return NO;