Generic and optional obj-c method

Test.swift

import Foundation

@objc protocol One: NSObjectProtocol {
    @objc optional func method()
}

class NoGenericBase: NSObject, One { }

class NoGenericImpl: NoGenericBase {
    func method() { print("second method") }
}

var noGeneric = NoGenericImpl()
if noGeneric.responds(to: #selector(One.method)) {
    print("no generic comform One.method")
} else {
    print("no generic NOT comforming One.method")
}

class GenericBase<Base>: NSObject, One { }

class GenericImpl: GenericBase<String> {
    func method() { print("second method") }
}

var generic = GenericImpl()
if generic.responds(to: #selector(One.method)) {
    print("generic comform One.method")
} else {
    print("generic NOT comform One.method")
}

class ObjcGenericImpl: GenericBase<String> {
    @objc func method() { print("second method") }
}

var genericObjc = ObjcGenericImpl()
if genericObjc.responds(to: #selector(One.method)) {
    print("generic+@objc comform One.method")
} else {
    print("generic+@objc NOT comform One.method")
}

TestOutput.txt

no generic comform One.method
generic NOT comform One.method
generic+@objc comform One.method