ios - Error with customized button -

i have error:

2013-08-01 01:09:18.433 vstuphelper[28332:11303] -[vhmasterviewcontroller popviewcontroller:]: unrecognized selector sent instance 0x7566410 2013-08-01 01:09:18.434 vstuphelper[28332:11303] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[vhmasterviewcontroller popviewcontroller:]: 

here code:

uibutton *bt=[uibutton buttonwithtype:uibuttontypecustom];     [bt setframe:cgrectmake(0, 0, 50, 30)];     [bt setimage:[uiimage imagenamed:@"menu.png"] forstate:uicontrolstatenormal];     [bt addtarget:self action:@selector(popviewcontroller:) forcontrolevents:uicontroleventtouchupinside];     uibarbuttonitem *leftbutton=[[uibarbuttonitem alloc] initwithcustomview:bt];     self.navigationitem.leftbarbuttonitem=leftbutton;      self.navigationitem.leftbarbuttonitem.target = self.revealviewcontroller;     self.navigationitem.leftbarbuttonitem.action = @selector(revealtoggle:); 

i'm not @ english, apologize if i'm hard understand.

you have several problems:

1) calling popviewcontroller: on asssume uiviewcontroller subclass, when should calling on uinavigationcontroller.

2) popviewcontroller: takes bool value whether animate transition. action, gets passed sender default.

3) reassign target , action button (but these don't called when create uibarbuttonitem using initwithcustomview: initializer: see docs).

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how fix this:

1) call method create button handler:

uibutton *bt=[uibutton buttonwithtype:uibuttontypecustom]; [bt setframe:cgrectmake(0, 0, 50, 30)]; [bt setimage:[uiimage imagenamed:@"menu.png"] forstate:uicontrolstatenormal]; [bt addtarget:self action:@selector(buttontouched:) forcontrolevents:uicontroleventtouchupinside]; uibarbuttonitem *leftbutton=[[uibarbuttonitem alloc] initwithcustomview:bt]; self.navigationitem.leftbarbuttonitem=leftbutton; 

2) in method, pop view controller, or whatever want do:

- (void)buttontouched:(id)sender  {     [self.navigationcontroller popviewcontroller:yes];      //or assigned button action:     [self.revealviewcontroller revealtoggle:(not sure you're supposed have here)]; }