There are a number of tools that you can use to improve the output after using the Swiftify converter.
Xcode’s Swift Migration Assistant
It’s always recommended to convert to the most recent version of Swift. However, if you have chosen to convert your code to Swift 3.2, you may be interested in Xcode’s built-in Swift 4 converter (Edit → Convert → To Current Swift Syntax…).
Some behavior around
@objc inference has changed in Swift 4. The Swift Migration Assistant can be helpful for cases such as adding the
@objcannotation to some methods.
Remember that the recommendation is to convert to Swift 4, but the Swift Migration Assistant can be useful if you wish to upgrade from 3.2 to 4 at a later stage.
You can find more information in the Swift 4 Migration Guide.