title: How to set focus on the next UITextView, after user types in 2 chars in the first one
body: <p>I have several text fields, where the user can input some data.
  every text field accepts 2 digit numbers as parameters.
  User experience wise, it's awesome if the focus is put to another text view, right after the number has been typed into the current UITextView.</p>
  
  <p>Let's say I have 2 UITextViews - txt1 and txt2.
  the user clicks on the txt1, keyboard appears and the user types in 2 digit number.</p>
  
  <p>Where in my code should i check, how many characters are input in a text view?</p>
  
  <p>I assume that I need some listener or something?</p>
  
  <p>When in that listener I get the notification that 2digit number is typed in, I should call </p>
  
  <pre><code>[_txt2 becomeFirstResponder];
  </code></pre>
  
  <p>This is just an idea, I dont have a chance to test it, as I'm not really sure how to setup the mentioned listener.</p>
  
  <p>Any ideas?</p>