title: Swift 3 - dynamic vs @objc
body: <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>