ios - Issues with UINavigationItem changing properties at runtime -

i have navigation bar, wich contains navigation item, contains 2 bar buttons, these created in storyboard, , wanted change 1 of buttons @ runtime, works:

- (void)viewdidload {     [super viewdidload];     // additional setup after loading view.      uinavigationitem *thisnavbar = [self mynavigationitem];     thisnavbar.rightbarbuttonitem = nil; // works, gets removed      uibarbuttonitem *insertbtn = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemedit target:self action:@selector(insertskemaitem:)];      thisnavbar.rightbarbuttonitem = insertbtn; // works, sets btn  } 

now, in other method, called controller, not work

- (void)callchildchange {       ...      // remove old btn     uinavigationitem *thisnavbar = [self skemanavigationitem];     thisnavbar.rightbarbuttonitem = nil; // not work? } 

there nothing wrong method, runs fine, nav btn item not removed ?

skemanavigationitem navigation item, declared in .h file links navigation item made via storyboard.

your ui items need added code (by ctrl-dragging) in header file (.h) can publicly accessed other classes/view controllers.

presuming you've done this, hiding ui item best done using

relevantclass.yourviewobject.hidden = yes; 

or if need delete good,

[relevantclass.yourviewobject.view removefromsuperview]; 

edits

options changing target method:

declare @property (nonatomic, assign) bool mybuttonwaspressed; and:

 - (ibaction) mybuttonpressed  {      if (!self.mybuttonwaspressed)      {          // code run first time button pressed          self.mybutton.text = @"new button text";          self.mybuttonwaspressed = yes;      }        else           {              // code run after first time button pressed              // can set bool property back, , make toggleable           }   } 

or

- (ibaction) mybuttonwaspressedfirsttime   {       // need when button pressed then...     self.mybutton.text = @"new button text";         [self.mybutton removetarget:self action:@selector(mybuttonpressedfirsttime) forcontrolevents:uicontroleventtouchupinside];     [self.mybutton addtarget:self action:@selector(mybuttonpressedagain) forcontrolevents: uicontroleventtouchupinside];    }  - (ibaction) mybuttonwaspressedagain {    // code run subsequent times button pressed }