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    <p>Here's the full implementation I eventually used for sending events when the headphones are plugged in (and unplugged).</p> <p>There was a fair amount of complexity I needed to deal with to ensure things still worked after the app was returned from the background.</p> <p>CVAudioSession.h file</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #define kCVAudioInputChangedNotification @"kCVAudioInputChangedNotification" #define kCVAudioInterruptionEnded @"kCVAudioInterruptionEnded" @interface CVAudioSession : NSObject +(void) setup; +(void) destroy; +(NSString*) currentAudioRoute; +(BOOL) interrupted; @end </code></pre> <p>CVAudioSession.m file</p> <pre><code>#import "CVAudioSession.h" #import &lt;AudioToolbox/AudioToolbox.h&gt; @implementation CVAudioSession static BOOL _isInterrupted = NO; +(void) setup { NSLog(@"CVAudioSession setup"); // Set up the audio session for recording OSStatus error = AudioSessionInitialize(NULL, NULL, interruptionListener, (__bridge void*)self); if (error) NSLog(@"ERROR INITIALIZING AUDIO SESSION! %ld\n", error); if (!error) { UInt32 category = kAudioSessionCategory_RecordAudio; // NOTE CANT PLAY BACK WITH THIS error = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(category), &amp;category); if (error) NSLog(@"couldn't set audio category!"); error = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, propListener, (__bridge void*) self); if (error) NSLog(@"ERROR ADDING AUDIO SESSION PROP LISTENER! %ld\n", error); UInt32 inputAvailable = 0; UInt32 size = sizeof(inputAvailable); // we do not want to allow recording if input is not available error = AudioSessionGetProperty(kAudioSessionProperty_AudioInputAvailable, &amp;size, &amp;inputAvailable); if (error) NSLog(@"ERROR GETTING INPUT AVAILABILITY! %ld\n", error); // we also need to listen to see if input availability changes error = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioInputAvailable, propListener, (__bridge void*) self); if (error) NSLog(@"ERROR ADDING AUDIO SESSION PROP LISTENER! %ld\n", error); error = AudioSessionSetActive(true); if (error) NSLog(@"CVAudioSession: AudioSessionSetActive (true) failed"); } } + (NSString*) currentAudioRoute { UInt32 routeSize = sizeof (CFStringRef); CFStringRef route; AudioSessionGetProperty (kAudioSessionProperty_AudioRoute, &amp;routeSize, &amp;route); NSString* routeStr = (__bridge NSString*)route; return routeStr; } +(void) destroy { NSLog(@"CVAudioSession destroy"); // Very important - remove the listeners, or we'll crash when audio routes etc change when we're no longer on screen OSStatus stat = AudioSessionRemovePropertyListenerWithUserData(kAudioSessionProperty_AudioRouteChange, propListener, (__bridge void*)self); NSLog(@".. AudioSessionRemovePropertyListener kAudioSessionProperty_AudioRouteChange returned %ld", stat); stat = AudioSessionRemovePropertyListenerWithUserData(kAudioSessionProperty_AudioInputAvailable, propListener, (__bridge void*)self); NSLog(@".. AudioSessionRemovePropertyListener kAudioSessionProperty_AudioInputAvailable returned %ld", stat); AudioSessionSetActive(false); // disable audio session. NSLog(@"AudioSession is now inactive"); } +(BOOL) interrupted { return _isInterrupted; } // Called when audio is interrupted for whatever reason. NOTE: doesn't always call the END one.. void interruptionListener( void * inClientData, UInt32 inInterruptionState) { if (inInterruptionState == kAudioSessionBeginInterruption) { _isInterrupted = YES; NSLog(@"CVAudioSession: interruptionListener kAudioSessionBeginInterruption. Disable audio session.."); // Try just deactivating the audiosession.. OSStatus rc = AudioSessionSetActive(false); if (rc) { NSLog(@"CVAudioSession: interruptionListener kAudioSessionBeginInterruption - AudioSessionSetActive(false) returned %.ld", rc); } else { NSLog(@"CVAudioSession: interruptionListener kAudioSessionBeginInterruption - AudioSessionSetActive(false) ok."); } } else if (inInterruptionState == kAudioSessionEndInterruption) { _isInterrupted = NO; // Reactivate the audiosession OSStatus rc = AudioSessionSetActive(true); if (rc) { NSLog(@"CVAudioSession: interruptionListener kAudioSessionEndInterruption - AudioSessionSetActive(true) returned %.ld", rc); } else { NSLog(@"CVAudioSession: interruptionListener kAudioSessionEndInterruption - AudioSessionSetActive(true) ok."); } [[NSNotificationCenter defaultCenter] postNotificationName:kCVAudioInterruptionEnded object:(__bridge NSObject*)inClientData userInfo:nil]; } } // This is called when microphone or other audio devices are plugged in and out. Is on the main thread void propListener( void * inClientData, AudioSessionPropertyID inID, UInt32 inDataSize, const void * inData) { if (inID == kAudioSessionProperty_AudioRouteChange) { CFDictionaryRef routeDictionary = (CFDictionaryRef)inData; CFNumberRef reason = (CFNumberRef)CFDictionaryGetValue(routeDictionary, CFSTR(kAudioSession_AudioRouteChangeKey_Reason)); SInt32 reasonVal; CFNumberGetValue(reason, kCFNumberSInt32Type, &amp;reasonVal); if (reasonVal != kAudioSessionRouteChangeReason_CategoryChange) { NSLog(@"CVAudioSession: input changed"); [[NSNotificationCenter defaultCenter] postNotificationName:kCVAudioInputChangedNotification object:(__bridge NSObject*)inClientData userInfo:nil]; } } else if (inID == kAudioSessionProperty_AudioInputAvailable) { if (inDataSize == sizeof(UInt32)) { UInt32 isAvailable = *(UInt32*)inData; if (isAvailable == 0) { NSLog(@"AUDIO RECORDING IS NOT AVAILABLE"); } } } } @end </code></pre>
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    1. POIs there an event for when the headphones are unplugged?
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