[swift-evolution] [Proposal] Make optional protocol methods first class citizens

[Rob Mayoff]

On Thu, Mar 31, 2016 at 10:56 AM, Thorsten Seitz via swift-evolution <
swift-evolution at swift.org> wrote:

>
> protocol UIGestureRecognizerDelegate {
>     var gestureRecognizerShouldBegin: ((gestureRecognizer:
> UIGestureRecognizer) -> Bool)? { get }
> }
>

UIGestureRecognizerDelegate has five methods that are "named"
gestureRecognizer:


   - gestureRecognizer(_:shouldRecognizeSimultaneouslyWithGestureRecognizer:
   )
   - gestureRecognizer(_:shouldRequireFailureOfGestureRecognizer:)
   - gestureRecognizer(_:shouldBeRequiredToFailByGestureRecognizer:)
   - gestureRecognizer(_:shouldReceiveTouch:)
   - gestureRecognizer(_:shouldReceivePress:)

You can only have a single property named "gestureRecognizer", so you
either have to come up with other names for these, or change the language
to allow closure-typed properties to have multipart names.

This problem has been noted before, for example here:
http://article.gmane.org/gmane.comp.lang.swift.evolution/8707/
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