ios - Some methods in class do not recognize that instance of MKMapView already exists -

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i trying turn on user tracking mode mkmapview. mkmapview part of storyboard, believe automatically initialized. when run debugger on viewdidload , viewdidappear, prints address of mkmapview, seems initialized. here methods in firstviewcontroller class:

    #import "firstviewcontroller.h"     #import "options.h"     #import "appdelegate.h"      @interface firstviewcontroller ()      @end      @implementation firstviewcontroller      - (void)viewdidload {         [super viewdidload];         // additional setup after loading view, typically nib.         appdelegate *appdelegate = (appdelegate *)[[uiapplication sharedapplication] delegate];         self.currentmap.delegate = self;         [appdelegate.locationmanager requestalwaysauthorization];         appdelegate.locationmanager.distancefilter = 20.0;      }      - (void)viewdidappear:(bool)animated {         [super viewdidappear:no];         if ([cllocationmanager authorizationstatus] != kclauthorizationstatusauthorizedalways)         {             uialertview *alert= [[uialertview alloc]initwithtitle:@"cannot access location"                                                 message:@"please allow location services in settings."                                                 delegate:nil                                                 cancelbuttontitle:@"ok"                                                 otherbuttontitles: nil];             [alert show];         }         self.currentmap.showsuserlocation = [[nsuserdefaults standarduserdefaults] boolforkey:@"maplocation"];     }      - (void)changetracking {         if (self.currentmap.usertrackingmode == mkusertrackingmodenone)         {             [self.currentmap setusertrackingmode:mkusertrackingmodefollow animated:yes];         }         else if (self.currentmap.usertrackingmode == mkusertrackingmodefollow)         {             [self.currentmap setusertrackingmode:mkusertrackingmodenone animated:yes];         }     }

when call [appdelegate.firstviewcontroller changetracking] class, changetracking method executes, thinks self.currentmap nil. when changes user tracking mode, doesn't have effect on map recognized viewdidload , viewdidappear. why first 2 methods recognize instance of mkmapview changetracking not?

you need better handle 1 what's going on.

do have outlet connected map view?

add nslog viewdidload method , log self.currentmap. log address of self.

then, in other methods, log address of self (using %x format string, , casting self unsigned long).

my guess: either outlet link broken or creating multiple instances of class without realizing it.


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