title: Change the text of a UILabel (UIBarButtonItem) on a toolbar programmatically
body: <p>I'm a beginner iPhone developer.
  My code is the following:</p>
  
  <pre><code>UIBarButtonItem *fixedSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];  
  UILabel *lblTotCaratteri = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 25, 15)];
  lblTotCaratteri.textAlignment = UITextAlignmentCenter;
  lblTotCaratteri.font = [UIFont italicSystemFontOfSize:13.0];
  lblTotCaratteri.textColor = [UIColor greenColor];
  lblTotCaratteri.backgroundColor = [UIColor clearColor];
  lblTotCaratteri.adjustsFontSizeToFitWidth = YES;
  lblTotCaratteri.text = @"0";
  
  UIBarButtonItem *lblCaratteri = [[UIBarButtonItem alloc] initWithCustomView: lblTotCaratteri];
  
  inserimentoToolbar.items = [NSArray arrayWithObjects:fixedSpace, lblCaratteri, fixedSpace, nil];
  </code></pre>
  
  <p>So in my view I have a UITextView and this toolbar created programmatically.
  I want to change the label text each time I add a character to the UITextView.
  Each time the UITextView text changes, I can display an alert each key pressed.
  I can't figure out how to change the label text.
  I hope I've explained my scenario.
  Sorry for my English.
  Greetings, Luca.</p>