<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">+1. Robert and I are toying with an implementation right now; it’s really straightforward.<div class=""><br class=""></div><div class="">— Harlan</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 30, 2016, at 3:16 PM, Ayaka Nonaka via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Hi Swift community,<blockquote style="margin:0 0 0 40px;border:none;padding:0px" class=""><div class=""><br class=""></div></blockquote><div class="">I was wondering if bridging Objective-C’s <font face="monospace, monospace" class="">@compatibility_alias</font> to Swift’s <font face="monospace, monospace" class="">typealias</font><font face="arial, helvetica, sans-serif" class=""> is something that we have considered adding support for.</font></div><div class=""><br class=""></div><div class=""><font face="arial, helvetica, sans-serif" class="">For example, </font><span style="font-family:monospace,monospace" class="">@compatibility_alias </span><font face="arial, helvetica, sans-serif" class="">is useful for things like adding an alias like </font><font face="monospace, monospace" class="">DCColor</font><font face="arial, helvetica, sans-serif" class=""> for </font><font face="monospace, monospace" class="">UIColor</font><font face="arial, helvetica, sans-serif" class=""> and </font><font face="monospace, monospace" class="">NSColor</font><font face="arial, helvetica, sans-serif" class=""> depending on the target. Here’s an example from our codebase:</font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><br class=""></font></div><font face="monospace, monospace" class="">// For color compatibility, we alias DCColor to the appropriate class<br class="">#if DC_TARGET_MOBILE<br class="">#import <UIKit/UIKit.h><br class="">@compatibility_alias DCColor UIColor;<br class="">#else<br class="">#import <Cocoa/Cocoa.h><br class="">@compatibility_alias DCColor NSColor;<br class="">#endif</font><div class=""><font face="monospace, monospace" class=""><br class=""></font></div><div class="">We expected <font face="monospace, monospace" class="">DCColor</font> 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 <span style="font-family:monospace,monospace" class="">@compatibility_alias</span><font face="arial, helvetica, sans-serif" class=""> for similar things and other things that are useful. It would be really cool to see seamless bridging between </font><font face="monospace, monospace" class="">@compatibility_alias</font> and <font face="monospace, monospace" class="">typealias</font>, especially since we’ve seen a lot of other great backwards compatibility features in Swift 3.0 like importing lightweight-generics and <font face="monospace, monospace" class="">#keyPath</font>.</div><div class=""><br class=""></div><div class="">Thanks for reading! :D</div><div class=""><font face="arial, helvetica, sans-serif" class=""><br class=""></font></div><div class=""><font face="arial, helvetica, sans-serif" class="">Ayaka</font></div><div class=""><font face="arial, helvetica, sans-serif" class=""><br class=""></font><div class=""><div class="">-- </div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class="">Ayaka Nonaka<div class=""><div class=""><a href="https://twitter.com/ayanonagon" target="_blank" class="">@ayanonagon</a> | <a href="http://www.ayaka.me/" target="_blank" class="">www.ayaka.me</a></div></div></div></div></div></div>
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