[swift-users] Swift 3 likes to tease me

Joe Groff jgroff at apple.com
Fri Sep 23 13:35:29 CDT 2016

> On Sep 22, 2016, at 9:51 PM, Gerriet M. Denkmann via swift-users <swift-users at swift.org> wrote:
> This line (Swift 3):
> 	if a.responds(to: Selector(“viewControllers") )
> creates this warning: Use '#selector' instead of explicitly constructing a 'Selector'
> Ok. Following this advice I change it to:
> 	if a.responds(to: #selector(“viewControllers"))
> and now get an error instead: Argument of ‘#selector' does not refer to an '@objc' method, property, or initializer

Others have answered your question, but this looks to me like an opportunity for us to improve the error message. Attempting to use #selector() with a string literal like this seems like a natural thing to try, and we could offer better diagnostics for this case. If you have a moment, would you be able to file a bug to improve the diagnostics in this case?


> Why do I get punished for following Xcode’s advice?
> Gerriet.
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