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

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()
}