title: Swift calculate value of UITextFields and return value
body: <p>Using swift and Xcode 6, I'm trying to return a value calculated based on content of few UITextFields. </p>
  
  <p>I have declared variables</p>
  
  <pre><code>var Number1 = Field1.text.toInt()
  var Number2 = Field2.text.toInt() 
  
  var Duration = Number1*Number2
  
  Mylabel.text = String ("\(Duration)")
  </code></pre>
  
  <p>The idea is to capture duration from few UI Fields and based on calculation of those values assign that to a variable as well as display it on a label.</p>
  
  <p>In line:  var Duration = Number1*Number2</p>
  
  <p>Challenge is that I have is that when performing multiplication Xcode highlight error: Value of optional type 'Int?' not unwrapped; did you mean to use '!' or '?'?</p>