title: How Programatically Add 9 even images to a view |Swift
body: <p>I'm struggling with this one, hope to find any help with the code.
  I'm trying to add programatically 9 images (3x3) which going to cover my whole UIView. 
  my question is, how can i divide my UIView to 9 even images to cover it all, and consider there's different between the iPhones screen size.
  I have no idea how to even start to customise it, just for example:</p>
  
  <pre><code>    firstImage.frame = CGRectMake(?,? ,200,200)
      secondImage.frame = CGRectMake(?,?, 200,200)
  </code></pre>