iOS >> UINavigation Item Back Button Title Doesn't Change -

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i'm trying set button pushed vc set within uinavigationcontroller stack. use following code, , it's not working - still previous vc name appearing button title.

-(void)viewwillappear:(bool)animated {      [super viewwillappear:animated];      self.title = @"vc title";      uibarbuttonitem* mybackbutton = [[uibarbuttonitem alloc]                                      initwithtitle:@"back"                                      style:uibarbuttonitemstylebordered                                      target:nil                                      action:nil];      self.navigationitem.backbarbuttonitem = mybackbutton;  }

anyone?

try setting title in parent view controller's viewdidload

uibarbuttonitem *custombaritem = [[uibarbuttonitem alloc] initwithtitle:@"back" style:uibarbuttonitemstylebordered target:self action:@selector(popview)];  self.navigationitem.leftbarbuttonitem = custombaritem;

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