title: swift multiple conditions if statement with && operation
body: <p>I have 4 text boxes.I don't want to allow user to let all these 4 textfields empty. How can I check multiple conditions in swift. I did like this but it's giving me an error</p>
  
  <pre><code> if self.txtIncomeAd.text?.isEmpty &amp;&amp; self.txtIncomeRec.text?.isEmpty &amp;&amp;
  </code></pre>
  
  <p>like wise. What is the correct way I can do this?
  Please help me.
  Thanks</p>