How to programmatically sense the iPhone mute switch?

Question

I can't seem to find in the SDK how to programatically sense the mute button/switch on the iPhone. When my app plays background music, it responds properly to the volume button without me having any code to follow that but, when I use the mute switch, it just keeps playing away.

How do I test the position of mute?

(NOTE: My program has its own mute switch, but I'd like the physical switch to override that.)

Answer 1

Thanks, JPM. Indeed, the link you provide leads to the correct answer (eventually. ;) For completeness (because S.O. should be a source of QUICK answers! )...

// "Ambient" makes it respect the mute switch // Must call this once to init session if (!gAudioSessionInited) {     AudioSessionInterruptionListener    inInterruptionListener = NULL;     OSStatus    error;     if ((error = AudioSessionInitialize (NULL, NULL, inInterruptionListener, NULL)))     {         NSLog(@"*** Error *** error in AudioSessionInitialize: %d.", error);     }     else     {         gAudioSessionInited = YES;     } }  SInt32  ambient = kAudioSessionCategory_AmbientSound; if (AudioSessionSetProperty (kAudioSessionProperty_AudioCategory, sizeof (ambient), &ambient)) {     NSLog(@"*** Error *** could not set Session property to ambient."); } 

Answer 2

I answered a similar question here (link). The relevant code:

 -(BOOL)silenced {      #if TARGET_IPHONE_SIMULATOR          // return NO in simulator. Code causes crashes for some reason.          return NO;      #endif      CFStringRef state;     UInt32 propertySize = sizeof(CFStringRef);     AudioSessionInitialize(NULL, NULL, NULL, NULL);     AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &propertySize, &state);     if(CFStringGetLength(state) > 0)             return NO;     else             return YES;      }