title: The use of Swift 3 @objc inference in Swift 4 mode is deprecated?
body: <p>Briefly, while using Xcode 9 Beta, I have run into the following warning:</p>
  
  <blockquote>
    <p>The use of Swift 3 @objc inference in Swift 4 mode is deprecated. Please address deprecated @objc inference warnings, test your code with “Use of deprecated Swift 3 @objc inference” logging enabled, and disable Swift 3 @objc inference.**</p>
  </blockquote>
  
  <p>After some research, I still have no idea how to fix the issue. 
  I would greatly appreciate any tips on how to fix this issue as well as an explanation of what is going on. </p>
  
  <p>My goal is to grasp a better understanding of what is happening with my code. </p>