ios - Detect plugIn or unplug of headphone jack from iPhone when my app is in background mode -


i want notify user when headphone jack pluggedin or unplugged iphone/ipod/ipad when app in background mode. here have code detects in foreground mode.

- (void)viewdidload {     [super viewdidload]; // additional setup after loading view, typically nib.       audiosessionaddpropertylistener(kaudiosessionproperty_audioroutechange, audiosessionpropertylistener, nil); }  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 reason route change, ensure not     //      because of category change.     cfdictionaryref routechangedictionary = indata;     cfnumberref routechangereasonref = cfdictionarygetvalue (routechangedictionary,cfstr (kaudiosession_audioroutechangekey_reason));      sint32 routechangereason;     cfnumbergetvalue (routechangereasonref, kcfnumbersint32type, &routechangereason);      // "old device unavailable" indicates headset unplugged, or     //  device removed dock connector supports audio output.     //    if (routechangereason != kaudiosessionroutechangereason_olddeviceunavailable)     //        return;      if (!isheadsetpluggedin())     {         audiosessionsetproperty (kaudiosessionproperty_overrideaudioroute,sizeof (audiorouteoverride),&audiorouteoverride);          nslog(@"with out headphone");     }     else     {         uint32 audiorouteoverride = kaudiosessionoverrideaudioroute_speaker;         audiosessionsetproperty (kaudiosessionproperty_overrideaudioroute, sizeof(audiorouteoverride), &audiorouteoverride);         nslog(@"headphone");     }  }

you try apple docs:

- (void)applicationdidenterbackground:(uiapplication *)application  {      bgtask = [application beginbackgroundtaskwithexpirationhandler:^{          // clean unfinished task business marking          // stopped or ending task outright.          [application endbackgroundtask:bgtask];          bgtask = uibackgroundtaskinvalid;  }];        // start long-running task , return immediately.      dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{            // work associated task, preferably in chunks.            [application endbackgroundtask:bgtask];          bgtask = uibackgroundtaskinvalid;      });  }

i think apple has given data in docs here: background execution , multitasking


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