ios - Create plus button as push at runtime -


in tableviewcontroller want create plus push button @ "run time" in viewdidload of tableviewcontroller trigger view.

i tried follows:

- (void)viewdidload {     [super viewdidload];      //     // create button in navigation     //      self.vc_addtodoitem = [[grf_vc_add_to_do_item alloc] init];      [self.navigationcontroller pushviewcontroller:self.vc_addtodoitem animated:no];      uibarbuttonitem *bt_plus = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemadd target:self.vc_addtodoitem action:@selector(add:)];      self.navigationitem.rightbarbuttonitem = bt_plus; }

the result table view not displayed. instead view displayed link table view. if press link, table view displayed. if press plus button crash.

what problem?

update:

i added add method in grf_vc_add_to_do_item. crash gone. method add called. don't know in method show view, therefore method empty @ moment. if press "+" button, nothing happens. call necessary in add method display view grf_vc_add_to_do_item?


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