On Aug 5, 2015, at 6:45 PM, Rick Mann <rm...@latencyzero.com> wrote: > >> >> On Aug 5, 2015, at 16:38 , Charles Srstka <cocoa...@charlessoft.com >> <mailto:cocoa...@charlessoft.com>> wrote: >> >> On Aug 5, 2015, at 6:22 PM, Rick Mann <rm...@latencyzero.com> wrote: >>> >>> I'd like to be able to write code like this: >>> >>> enum MyNotifications : String { >>> case Note1 = "note1" >>> case Note2 = "note2" >>> } >>> >>> let nc = NSNotificationCenter.defaultCenter() >>> nc.postNotificationName(MyNotifications.Note1, nil) >>> >>> But Swift (2.0) doesn't let me do that. Is it possible to write an >>> extension method to NSNotificationCenter that accepts "any enum derived >>> from String" (or that's convertible to String, or something like that)? >>> e.g.: >>> >>> func postNotification(inName : enum:String) >>> >>> I tried doing this: http://pastebin.com/kXLEHu8f >>> >>> But it gets multiple errors, as you can see. >>> >>> Is there an elegant way to do this? Seems counter-intuitive that I can't >>> pass a derived enum in place of an ancestral type. >> >> AFAIK there’s no way to do exactly what you’re asking for, but you could put >> a post() method on the enum itself. > > Well, that kinda works, for a single enum, but I can't derive an enum from > that because I run into this when I subclass an enum. > > playground28.swift:26:16: error: raw type 'Notes' is not convertible from any > literal > enum MyNotes : Notes > ^ > playground28.swift:26:6: error: type 'MyNotes' does not conform to protocol > 'RawRepresentable' > enum MyNotes : Notes > ^ > Swift.RawRepresentable:11:13: note: protocol requires nested type 'RawValue' > typealias RawValue
I get that error any time I try to subclass *any* enum. I don’t think enums are supposed to be subclassable. Charles _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
