[swift-evolution] Objective-C’s @compatibility_alias => Swift’s typealias?

[Andrew Bennett]

+1 I was just thinking the same thing a few days ago, thanks for bringing
it up!

On Friday, 1 July 2016, Sean Heber via swift-evolution <
swift-evolution at swift.org> wrote:

> Makes sense to me!
>
> l8r
> Sean
>
> Sent from my iPad
>
> On Jun 30, 2016, at 5:16 PM, Ayaka Nonaka via swift-evolution <
> swift-evolution at swift.org
> <javascript:_e(%7B%7D,'cvml','swift-evolution at swift.org');>> wrote:
>
> Hi Swift community,
>
>
> I was wondering if bridging Objective-C’s @compatibility_alias to Swift’s
> typealias is something that we have considered adding support for.
>
> For example, @compatibility_alias is useful for things like adding an
> alias like DCColor for UIColor and NSColor depending on the target.
> Here’s an example from our codebase:
>
> // For color compatibility, we alias DCColor to the appropriate class
> #if DC_TARGET_MOBILE
> #import <UIKit/UIKit.h>
> @compatibility_alias DCColor UIColor;
> #else
> #import <Cocoa/Cocoa.h>
> @compatibility_alias DCColor NSColor;
> #endif
>
> We expected DCColor to be exposed to our Swift code, but it turns out
> that it is not. I’d imagine that we’re not the only ones using
> @compatibility_alias for similar things and other things that are useful.
> It would be really cool to see seamless bridging between
> @compatibility_alias and typealias, especially since we’ve seen a lot of
> other great backwards compatibility features in Swift 3.0 like importing
> lightweight-generics and #keyPath.
>
> Thanks for reading! :D
>
> Ayaka
>
> --
> Ayaka Nonaka
> @ayanonagon <https://twitter.com/ayanonagon> | www.ayaka.me
>
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