Can't get a notification when connecting an external accessory to the 3.5 mm headphones jack

I've been trying to get this to work for a while now. I've done everything they say in the documentation and still got nothing.

This is the code in my app delegate that registers for local notifications:

- (void) registerForLocalNotifications {
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(_accessoryConnected:)
                                             name:EAAccessoryDidConnectNotification
                                           object:nil];


[[NSNotificationCenter defaultCenter] addObserver:self
                                         selec开发者_开发问答tor:@selector(_accessoryDisconnected:)
                                             name:EAAccessoryDidDisconnectNotification
                                           object:nil];

[[EAAccessoryManager sharedAccessoryManager] registerForLocalNotifications]; }

The above is called from applicationDidFinishLaunching.

Here is the code of the connect/disconnect methods:

- (void) _accessoryConnected:(NSNotification *)notification {
          NSLog(@"_accessoryConnected"); }

- (void) _accessoryDisconnected:(NSNotification*)notification {
NSLog(@"_accessoryDisconnected"); }


-(void) accessoryDidDisconnect:(EAAccessory *) accessory {
NSLog(@"accessoryDidDisconnect"); }

Tried connecting the headphones that come with the iPhone and got nothing, same for my external accessory I want to integrate with the app.

Please help, Thanks, Shaul.

You should use AudioSessionPropertyListener for this. EAAccessory notifications are for hardware that connects to the 30 pin port. Add this listener in viewDidLoad and remove it in ViewDidUnLoad

AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, audioSessionPropertyListener, nil);

Add the following methods in the view controller.

BOOL isHeadsetPluggedIn() {
    UInt32 routeSize = sizeof (CFStringRef);
    CFStringRef route;

    OSStatus error = AudioSessionGetProperty (kAudioSessionProperty_AudioRoute,
                                              &routeSize,
                                              &route
                                              );    
    NSLog(@"%@", route);
    return (!error && (route != NULL) && ([(NSString*)route rangeOfString:@"Head"].location != NSNotFound));
}

void audioSessionPropertyListener(void* inClientData, AudioSessionPropertyID inID,
                                  UInt32 inDataSize, const void* inData) {
    UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;

    // Determines the reason for the route change, to ensure that it is not
    //      because of a category change.
    CFDictionaryRef routeChangeDictionary = inData;    
    CFNumberRef routeChangeReasonRef = CFDictionaryGetValue (routeChangeDictionary,CFSTR (kAudioSession_AudioRouteChangeKey_Reason));

    SInt32 routeChangeReason;    
    CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason);

    // "Old device unavailable" indicates that a headset was unplugged, or that the
    //  device was removed from a dock connector that supports audio output. 
    if (routeChangeReason != kAudioSessionRouteChangeReason_OldDeviceUnavailable)
        return;

    if (!isHeadsetPluggedIn()) 
    {
        AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);
    }
    else 
    {
        UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
        AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);
    }    
}

Note, I got this code long ago from somewhere and it worked for me. Cannot attribute the source now as I don't know where I got it from.