hide and show left navigation bar button on demand in iOS-7

Question

I added my left navigation bar button using the storyboard. but I want it to hide when I first load the screen. And then in response to something else, I want it to show. The na

Answer 1

Here is how I solved it

-(void) hideAndDisableRightNavigationItem
{
    [self.navigationItem.rightBarButtonItem setTintColor:[UIColor clearColor]];
    [self.navigationItem.rightBarButtonItem setEnabled:NO];
}

-(void) showAndEnableRightNavigationItem
{
    [self.navigationItem.rightBarButtonItem setTintColor:[UIColor blackColor]];
    [self.navigationItem.rightBarButtonItem setEnabled:YES];
}

Answer 2

Here is what I did. On the initial screen I wanted to hide the navigation bar:

 self.navigationController.navigationBarHidden = YES;

On the second screen I wanted to show the navigation bar so I set:

 self.navigationController.navigationBarHidden = NO;

Answer 3

Swift version of @learner answer

func hideAndDisableRightNavigationItem (){
  self.navigationItem.rightBarButtonItem?.enabled = false
  self.navigationItem.rightBarButtonItem?.tintColor = UIColor.clearColor()
}

func showAndEnableRightNavigationItem(){
   self.navigationItem.rightBarButtonItem?.enabled = true
   self.navigationItem.rightBarButtonItem?.tintColor = UIColor. blackColor()
}