ios - Objective C method not working properly inside objective C++ -

i'm calling objective c method in objective c++ class create label hiding status bar status bar hiding fine while label not getting created , shown! if call method anywhere else other objective c++ class works fine without issue

the objective c++ class below

void audioroutechangelistenercallback (void *inuserdata, audiosessionpropertyid inpropertyid, uint32 inpropertyvaluesize, const void *inpropertyvalue )  {    // ensure callback invoked route change    if (inpropertyid != kaudiosessionproperty_audioroutechange) return;     {        // determines reason route change, ensure not        //      because of category change.        cfdictionaryref routechangedictionary = (cfdictionaryref)inpropertyvalue;         cfnumberref routechangereasonref = (cfnumberref)cfdictionarygetvalue (routechangedictionary, cfstr (kaudiosession_audioroutechangekey_reason) );        sint32 routechangereason;        cfnumbergetvalue (routechangereasonref, kcfnumbersint32type, &routechangereason);         if (routechangereason == kaudiosessionroutechangereason_olddeviceunavailable) {             //handle headset unplugged            nslog(@"pluggedout");          }        else if (routechangereason == kaudiosessionroutechangereason_newdeviceavailable)        {            //handle headset plugged in            nslog(@"something plugged in");             audiotest *test = [[audiotest alloc] init];            armorcontroller *armorcontroller =[[armorcontroller alloc]init];          nslog(@"%d", [test checkheadphonestatus]);             if([test checkheadphonestatus] == 1)             {          [armorcontroller deviceconnectedalert];             }             else if([test checkheadphonestatus] == 0)             {                 nslog(@"device not connected");             }          }      } 

the objective c method not executing inside objective c++ class below

- (void) deviceconnectedalert {     [[uiapplication sharedapplication] setstatusbarhidden:yes withanimation:uistatusbaranimationfade];        self.titlelabel = [[uilabel alloc] initwithframe:cgrectmake(20, 20, 320, 30)];     [self.titlelabel settext:@"device connected successfully!"];     self.titlelabel.backgroundcolor =[uicolor redcolor];     [self.view addsubview:self.titlelabel];  }