Candidate is not '@objc' but protocol requires it

Question

I have been following this tutorial to learn swift & iOS app development. In the Protocol section, the tutorial defined the following protocol:

@objc protoco         


        

Answer 1

Looks like we only need to prefix protocol method with @objc in private class.

private class A: NSObject, SomeObjcProtocol {
  @objc func someProtocolMethod() {}
}

Warning is not likely to rise for non-private class.

class A: NSObject, SomeObjcProtocol {
  func someProtocolMethod() {}
}

Both are fine.