ios - Getting error for passed in UserId in tab controller? -

i not sure why keep getting error, pass userid profile view controller on button click push:

totaltabcontroller *usertabview = [[uistoryboard storyboardwithname:@"main" bundle:nil] instantiateviewcontrollerwithidentifier:@"usertabview"];     usertabview.userprofileid = userid;      nslog(@"the user tota tab %@", userid);     usertabview.userprofilename = profilename;     [self.navigationcontroller pushviewcontroller:usertabview animated:no]; 

the nslog prints out correct userid, , have added tab controller in .h file so:

@interface totaltabcontroller : uitabbarcontroller {     nsstring *userprofileid, *userprofilename; }  @property (nonatomic, retain) nsstring *userprofileid; @property (nonatomic, retain) nsstring *userprofilename; 

and in .m file so:

@synthesize userprofileid, userprofilename;  - (void)viewdidload {     [super viewdidload];     nslog(@"the  tab loaded , %@", userprofileid); } 

but nslog prints out null in .m file...

then call in 1 of tab views .m file so:

userprofileid = [(totaltabcontroller*)self.tabbarcontroller userprofileid]; 

and error:

the error is:

2014-05-17 11:49:04.667 example[1108:60b] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '*** -[__nsplaceholderdictionary initwithobjects:forkeys:count:]: attempt insert nil object objects[0]' *** first throw call stack: (     0   corefoundation                      0x01e291e4 __exceptionpreprocess + 180     1   libobjc.a.dylib                     0x01ba88e5 objc_exception_throw + 44     2   corefoundation                      0x01def376 -[__nsplaceholderdictionary initwithobjects:forkeys:count:] + 390     3   corefoundation                      0x01e1cc29 +[nsdictionary dictionarywithobjects:forkeys:count:] + 73     4   example                               0x00012233 -[createdcollectionviewcontroller getcreatednames] + 419     5   example                               0x0001202b -[createdcollectionviewcontroller viewdidload] + 123     6   uikit                               0x0098733d -[uiviewcontroller loadviewifrequired] + 696     7   uikit                               0x009875d9 -[uiviewcontroller view] + 35     8   uikit                               0x009bf11f -[uitabbarcontroller transitionfromviewcontroller:toviewcontroller:transition:shouldsetselected:] + 407     9   uikit                               0x009be943 -[uitabbarcontroller transitionfromviewcontroller:toviewcontroller:] + 63     10  uikit                               0x009babed -[uitabbarcontroller _setselectedviewcontroller:] + 281     11  uikit                               0x009baacc -[uitabbarcontroller setselectedviewcontroller:] + 180     12  uikit                               0x009b7e30 __87-[uitabbarcontroller _selectdefaultviewcontrollerifnecessarywithappearancetransitions:]_block_invoke + 43     13  uikit                               0x008ce81f +[uiview(animation) performwithoutanimation:] + 82     14  uikit                               0x009b7cd5 -[uitabbarcontroller _selectdefaultviewcontrollerifnecessarywithappearancetransitions:] + 247     15  uikit                               0x009b8ae9 -[uitabbarcontroller viewwillappear:] + 148     16  uikit                               0x0098b04b -[uiviewcontroller _setviewappearstate:isanimating:] + 448     17  uikit                               0x0098b548 -[uiviewcontroller __viewwillappear:] + 114     18  uikit                               0x0099c105 -[uiviewcontroller(uicontainerviewcontrollerprotectedmethods) beginappearancetransition:animated:] + 199     19  uikit                               0x009a1a5e -[uinavigationcontroller _startcustomtransition:] + 1062     20  uikit                               0x009ae8f7 -[uinavigationcontroller _startdeferredtransitionifneeded:] + 688     21  uikit                               0x009af4e9 -[uinavigationcontroller __viewwilllayoutsubviews] + 57     22  uikit                               0x00af00d1 -[uilayoutcontainerview layoutsubviews] + 213     23  uikit                               0x008d7964 -[uiview(calayerdelegate) layoutsublayersoflayer:] + 355     24  libobjc.a.dylib                     0x01bba82b -[nsobject performselector:withobject:] + 70     25  quartzcore                          0x0455045a -[calayer layoutsublayers] + 148     26  quartzcore                          0x04544244 _zn2ca5layer16layout_if_neededepns_11transactione + 380     27  quartzcore                          0x045440b0 _zn2ca5layer28layout_and_display_if_neededepns_11transactione + 26     28  quartzcore                          0x044aa7fa _zn2ca7context18commit_transactionepns_11transactione + 294     29  quartzcore                          0x044abb85 _zn2ca11transaction6commitev + 393     30  quartzcore                          0x045695b0 +[catransaction flush] + 52     31  uikit                               0x008669bb _uiapplicationhandleeventqueue + 13095     32  corefoundation                      0x01db277f __cfrunloop_is_calling_out_to_a_source0_perform_function__ + 15     33  corefoundation                      0x01db210b __cfrunloopdosources0 + 235     34  corefoundation                      0x01dcf1ae __cfrunlooprun + 910     35  corefoundation                      0x01dce9d3 cfrunlooprunspecific + 467     36  corefoundation                      0x01dce7eb cfrunloopruninmode + 123     37  graphicsservices                    0x03be85ee gseventrunmodal + 192     38  graphicsservices                    0x03be842b gseventrun + 104     39  uikit                               0x00868f9b uiapplicationmain + 1225     40  stand                               0x00013a3d main + 141     41  libdyld.dylib                       0x02575701 start + 1 ) libc++abi.dylib: terminating uncaught exception of type nsexception (lldb)  

the ultimate goal pass userid profile.m file tab controller , allow each tab have access userid, not sure doing wrong, if can notice error or let me know how can have not null , accessible?

update thinking maybe has not being able push tabcontroller according apple's guidelines, case? if how go around it, or options have?

hi problem here trying push tab bar controller in navigation controller apple forbids link .so can add tabbar controller modally or create custom tab bar in view controller , push it