title: What is key Path in user defined runtime attributes?
body: <p>I have inherited a project and i'm confused on what a certain key is. 
  My question is, what is the <em>styleName</em> key Path ? is it a property to the view ? How can i find out what key Paths are available ?</p>
  
  <p>For example, after i select a UILabel from the storyboard i check the identity inspector and in the user defined runtime attributes i see the following:</p>
  
  <p><img src="https://i.stack.imgur.com/0qdde.png" alt="enter image description here"></p>
  
  <p>I have tried opening the main-styles.plist file but not sure how its linked together. </p>
  
  <p>when i click on the attribute inspector (while still keeping the UILabel in the storyboard highlighted) this is what it looks like:</p>
  
  <p><img src="https://i.stack.imgur.com/v0DGX.png" alt="enter image description here"></p>