Comment by Mark Sands (JIRA)

JamieWhite (JIRA User) You can specify the generic type in your selector. Add <UIControl> in the failing line:

addTarget(trampoline, action: #selector(ActionTrampoline<UIControl>.action(_:)), forControlEvents: events)

Comment by Mark Sands (JIRA)

I created a radar for Xcode here 26031273, or reach out to me on twitter @marksands if someone from Apple actually wants to provide feedback 😉

FYI, a very simple test case to break Xcode's current behavior is this:

import Foundation

class TestClass<T> {
    let testSelector: Selector = "action" // Xcode should convert to #selector(TestClass<T>.action)
    @objc func action() { }
}

I have a patch, but the worrying thing about fixing this is that the fixit is still "wrong" in a lot of cases. Where before (replace without the generic param list) we would complain about not knowing how to, say, instantiate T in TestClass, now we get a fully spelled out type with an undeclared generic type parameter in it. Essentially: In non-generic contexts the fixit is just shuffling one error around for another.