title: How to make UITextField become firstresponder using its tag field
body: <p>I have several UITextfields, I am trying to set the first responder to be the first UITextField which its tag should equal 0.</p>
  
  <p>This is how I am trying to achieve this in code</p>
  
  <pre><code>[[self.cutField viewWithTag:0] becomeFirstResponder];
  </code></pre>
  
  <p>But the problem being is that this UITextField never becomes the first responder.</p>