Swift should have a keyword to mark a protocol method as optional, every solution right now feels like a band aid which doesn't fix the problem. @objc isn't great, a protocol extension with an empty implementation is better, but still not great. This feels like Swift should have a keyword to mark a section or individual methods as optional

@cocoasamurai why isn’t a default implementation identical and nicer? Forcing the function itself to be optional (ie requiring optional chaining) feels annoying.

@cocoaphony it accomplishes the desired effect, but it doesn't communicate it very well. ObjC protocols do this very easily at the time of protocol declaration with the optional & required keywords, no further source code or documentation reading is required to understand what you do, or don't have to implement.

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@cocoasamurai @cocoaphony A nice alternative would be either:
- An annotation at declaration level to notify that a default implementation exists, for instance `@implemented func foo() -> Bar`
- A required override hint at re-implementation level, so that the dev knows there's a default impl, similar to subclasses and `@override` keyword

@bmt @cocoaphony i'd probably go for a declaration level solution myself. It feels like the problem is a lack of an official annotation to express this concept rather than how it is actually implemented

@cocoasamurai @cocoaphony Yes indeed. The concept is sound, we just miss a piece of information to convey that the method is already implemented (and thus optional), but I wouldn't go back to Obj-C style with optional chaining, respondsToSelector etc.

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