title: Input text into a text field using a button?
body: <p>I'm trying to make a VAT converter which gets the VAT percentage of a slider and applies it to a value taken from a UITextField, then outputs it to another text field. My button push action looks like this:</p>
  <pre><code>@IBaction func Calculate(sender: AnyObject){ 
  var curentval = Int(Slider.value) // Get the vat % from the slider 
  var sum = Sum.text.toInt() // 
  var VAT = sum! * curentval/100 // this is what I'm trying to output in a text field that is called VAT
  </code></pre>