title: UIView border with fade or blur effect
body: <p>I'm looking for method to add gradually fading  or maybe blured border (I don't exactly know how to name this effect) to arbitrary UIView. I don't need animated effect, I need static effect, for example I my UITableView border being partially transparent. I've made the example: </p>
  
  <p><img src="https://i.stack.imgur.com/Nwv49.png" alt="enter image description here"></p>
  
  <p>So you can see what I'm trying to do.</p>
  
  <p>Can anyone help me?</p>