title: how to repeat animation forever in Swift (HUGE_VALF)?
body: <p>According to the docs, the way to repeat a CABasicAnimation forever is to set its <code>repeatCount</code> to <code>HUGE_VALF</code>.</p>
  
  <p>But in Swift, <code>HUGE_VALF</code> causes a compile error. Swift doesn't seem to know about the standard library (or wherever this constant resides).</p>
  
  <p>What do I do now?</p>