title: How to add UIBarbuttonitem different on navigationbar in each tabbar item iOS
body: <p>I push Viewcontroller (viewcontroller 1) that including uitabbarcontroller has 3 viewcontroller (tabitem 1, tabitem 2, tabitem 3) .Now i want in each tabbaritem has different UIBarbuttonitem on uinavigationBar. Exm: in tabitem 1 hass "1" barbuttonitem , in tabitem 2 has "2" barbuttonitem, in tabitem 3 has no barbuttonitem. How can i do it?</p>
  
  <p>this is my code to created UItabbarcontroller:</p>
  
  <pre><code> - (void)viewDidLoad
  {
      [super viewDidLoad];
     // loginview = [[LoginTab alloc] init];
      // Do any additional setup after loading the view from its nib.
      self.tab=[[UITabBarController alloc]init];
      CGRect screenBounds = [[UIScreen mainScreen] bounds];
      if (screenBounds.size.height == 568)
      {
          // code for 4-inch screen
          //  LoginButton.frame = CGRectMake(0, 518, 80, 49);
          self.tab.view.frame = CGRectMake(0,0,320,568);
      }
      else if (screenBounds.size.height == 1024)
      {
          //code for ipad
  
      }
      else  if (screenBounds.size.height == 480)
      {
          // code for 3.5-inch screen
          //  LoginButton.frame = CGRectMake(0, 430, 80, 49);
          self.tab.view.frame = CGRectMake(0,0,320,480);
      }
  
      // FirstViewController
      UploadTab *uploadview=[[UploadTab alloc]initWithNibName:nil bundle:nil];
  
      uploadview.title=@"Uploading";
      uploadview.tabBarItem.image=[UIImage imageNamed:@"Uploading.png"];
  
      //SecondViewController
      ConvertTab *convertView=[[ConvertTab alloc]initWithNibName:nil bundle:nil];
  
      convertView.title=@"Convert";
      convertView.tabBarItem.image=[UIImage imageNamed:@"Convert.png"];
  
      //ThirdViewController
      CompletedTab *completedView=[[CompletedTab alloc]initWithNibName:nil bundle:nil];
  
      completedView.title=@"Completed";
      completedView.tabBarItem.image=[UIImage imageNamed:@"Completed.png"];
  
       self.tab.viewControllers=[NSArray arrayWithObjects:uploadview,convertView, completedView, nil];    
  
      [self.view addSubview:self.tab.view];
      //[self presentModalViewController:self.tab animated:NO]; // if use it, tabbar at bottom of screen correctly
  
  }
  </code></pre>
  
  <p>Also, I use above code, tabbar is show position not correct, it not at bottom of screen. 
  Pls give me any ideas? Thanks much</p>