After installing Xcode 9 and migrating to Swift 4 from Swift 3 I received this warning:

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 then disable inference by changing the “Swift 3 @objc Inference” build setting to “Default” for the “AppName” target.

 

I resolved this issue by going to the projects build target.  Selecting “Build Settings”.  Searching for “Inference” then changing the setting for “Swift 3 @objc Inference” from “On” to “Default”.  If you have multiple targets in your project you may have to do this for each target.

 

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How to fix the Swift 4 @objc inference warning
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