Swift 3 - dynamic vs @objc
<p>What's the difference between marking a method as @objc vs dynamic, when would you do one vs the other?</p>

<p>Below is Apple's definition for dynamic.</p>

<blockquote>
  <p>dynamic Apply this modifier to any member of a class that can be
  represented by Objective-C. When you mark a member declaration with
  the dynamic modifier, access to that member is always dynamically
  dispatched using the Objective-C runtime. Access to that member is
  never inlined or devirtualized by the compiler.</p>
  
  <p>Because declarations marked with the dynamic modifier are dispatched
  using the Objective-C runtime, they’re implicitly marked with the objc
  attribute.</p>
</blockquote>