uitabbarcontroller - Objective C: How to reload a view controller's table view when tab is selected -


i need reload data in view controller when it's tabbar clicked.

i using uitabbarcontrollerdelegate method below:

- (void)tabbarcontroller:(uitabbarcontroller *)tabbarcontroller didselectviewcontroller:(uiviewcontroller *)viewcontroller {     if (tabbarcontroller.selectedindex == 3)      {         [(someviewcontroller *)viewcontroller getdata];     } }

where 'getdata' instance method in someviewcontroller class. when run app, following error

2011-07-01 02:12:11.193 onethingaday[19169:207] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[uinavigationcontroller getdata]: unrecognized selector sent instance 0x600d500'

can advise me how can overcome issue? need trigger 'getdata' method when tabbarcontroller.selected index ==3

it seems me error message get, use uinavigationcontroller in tab controller; in case, cannot send directly getdata message it; should first find out view controller under uinavigationcontroller should receive message. (this not related tab bar selectedindex)

i don't know how uinavigationcontroller organized, do:

 - (void)tabbarcontroller:(uitabbarcontroller *)tabbarcontroller didselectviewcontroller:(uiviewcontroller *)viewcontroller {      if (tabbarcontroller.selectedindex == 3) {     //-- option 1: getdata goes first view controller in uinavigationcontroller:          [[(someviewcontroller*)[(uinavigationcontroller*)viewcontroller topviewcontroller] getdata];     //-- option 2: getdata goes last view controller in uinavigationcontroller (the visible one):          [[(someviewcontroller*)[(uinavigationcontroller*)viewcontroller visibleviewcontroller] getdata];       }  }

if give more details organization of uinavigationcontroller can further identifying right option.

anyway, can see casts, there not ok design. suggest using notification that. i.e., someviewcontroller registers notification of given type :

 [[nsnotificationcenter defaultcenter] addobserver:self                               selector:@selector(someselector:)                               name:shouldgetdatanotification                               object:nil];

and tab bar controller sends notification controller react upon:

 - (void)tabbarcontroller:(uitabbarcontroller *)tabbarcontroller didselectviewcontroller:(uiviewcontroller *)viewcontroller {      if (tabbarcontroller.selectedindex == 3) {        [[nsnotificationcenter defaultcenter] postnotificationname:shouldgetdatanotification object:nil];      }   .... }

look @ this post.


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