title: How to append more text into UILabel in iOS?
body: <p>I want to append more text behind UILabel in iOS.</p>
  
  <p>In other languages, we can add following as:</p>
  
  <pre><code>String s += textBox.text;
  </code></pre>
  
  <p>We can use (+=) sign in others languages.</p>
  
  <p>In Objective-C , I don't know how to add into label.</p>
  
  <p>Please help me.</p>