Xcode 8 Warning “Instance method nearly matches optional requirement”

Question

I converted my (macOS) project to Swift 3 in Xcode 8 and I get the following warnings with several delegate methods I implement in swift classes:

Instance me         


        

Answer 1

This had me going around in circles. It was because I created my own Notification class. Once I changed this class name (don't refactor as it will change the objc Notification paramaters), all errors disappeared