title: Where to store constant values in swift?
body: <p>I'm trying to build my first spritekit game in swift. I don't understand where to store constants so I can make them available to the whole project. I have some experience with C++ and I used to create a Constants.h file. Is there such thing in Swift? What's the recommended practice to do this?</p>
  
  <p>Right now I'm using a struct with static constants but I'm not sure if it's the right way to do it:</p>
  
  <pre><code>struct Constants {
      static let gravity : Int = 20
  }
  </code></pre>