[swift-users] Doubt about the runtime system

[Brent Royal-Gordon]

> On Jun 6, 2017, at 6:55 AM, Ronaldo Faria Lima via swift-users <swift-users at swift.org> wrote:
> 
> The /perform/ method may fail if the configured class does not have it. But, testing for the method existence by using /responds(to:)/ always return false. 


That's odd. Could you use `aClass.instancesRespond(to: sel)` instead?

-- 
Brent Royal-Gordon
Architechies

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