#selector() and the responder chain

With the new syntax for selectors in Swift 2.2 the approach I used in “Utilize the responder chain for target action” produces a warning. Let’s fix that.

Protocols for president

First we add a protocol:

@objc protocol DetailShowable {
  @objc func showDetail()
}

Then we can add an extension to Selector as described in this awesome post by Andyy Hope that looks like this:

private extension Selector {
  static let showDetail = #selector(DetailShowable.showDetail)
}

Adding the action to the responder chain is then as easy as this:

button.addTarget(nil,
                 action: .showDetail,
                 forControlEvents: .TouchUpInside)

Then some responder object in the responder chain needs to conform to the DetailShowable protocol.

You can find the code on github.