Oh, whoops! Good catch, Martin. I guess I was working from outdated information
here. The Radar I mentioned is something else; this one is
<rdar://problem/28208090> Generated interface for import-as-member doesn't
include context.
Jordan
> On Sep 27, 2017, at 11:45, Martin R via swift-users <swift-users@swift.org>
> wrote:
>
> Could it be that this is (just) a problem of the generated interface _view_ ?
> With
>
> extern NSAttributedStringKey ODRolloverTokenAttributeName;
>
> in an Objective-C header the "Generated Interface" is displayed as
>
> public static let ODRolloverTokenAttributeName: NSAttributedStringKey
>
> as you noticed, but I can use it from Swift as
>
> let key = NSAttributedStringKey.ODRolloverTokenAttributeName
>
> so it is actually a property of NSAttributedStringKey, not a global variable.
> And with
>
> extern NSAttributedStringKey ODRolloverTokenAttributeName
> NS_SWIFT_NAME(rolloverToken);
>
> in the Objective-C header I can use it from Swift as
>
> let key = NSAttributedStringKey.rolloverToken
>
> So – unless I am misunderstanding something – the
> ODRolloverTokenAttributeName defined in the Objective-C header file is
> actually imported to Swift as an extension to NSAttributedStringKey, even if
> the generated interface view in Xcode displays it as a global variable.
>
> Regards, Martin
>
>
>> Am 27.09.2017 um 16:07 schrieb Marco Masser via swift-users
>> <swift-users@swift.org>:
>>
>> Hi,
>>
>> Swift 4 and the macOS 10.13 SDK added a new NSAttributedStringKey type for
>> the keys that NSAttributedStrings use. The keys are then defined in an
>> extension of NSAttributedStringKey, essentially like this in AppKit:
>>
>> // AppKit/NSAttributedString.h (Objective-C)
>> extern NSAttributedStringKey NSFontAttributeName;
>>
>> // Generated Swift Interface
>> extension NSAttributedStringKey {
>> public static let font: NSAttributedStringKey
>> }
>>
>>
>> How do I get my own custom NSAttributedStringKeys to be imported this way?
>> When I do it like AppKit, it doesn’t seem to work:
>>
>> // My Objective-C header
>> extern NSAttributedStringKey ODRolloverTokenAttributeName;
>>
>> // Generated Swift Interface
>> static let ODRolloverTokenAttributeName: NSAttributedStringKey
>>
>>
>> That is obviously not the same. I tried using the NS_SWIFT_NAME macro, but
>> that results in the symbol disappearing in Swift completely:
>>
>> // My Objective-C header
>> extern NSAttributedStringKey ODRolloverTokenAttributeName
>> NS_SWIFT_NAME(NSAttributedStringKey.rolloverToken);
>>
>>
>> I also tried to use the swift_name attribute that is used by the
>> NS_SWIFT_NAME macro and that is even mentioned in SE-0044 for exactly this
>> purpose, but the symbol still disappears:
>> https://github.com/apple/swift-evolution/blob/master/proposals/0044-import-as-member.md#swift_name-attribute
>>
>> extern const NSAttributedStringKey ODRolloverTokenAttributeName
>> __attribute__((swift_name("NSAttributedStringKey.rolloverToken")));
>>
>>
>> What works is to manually define it in an extension like this, but that’s no
>> fun:
>>
>> // My Objective-C header
>> extern NSAttributedStringKey ODRolloverTokenAttributeName
>> NS_REFINED_FOR_SWIFT;
>>
>> extension NSAttributedStringKey {
>> static let rolloverToken =
>> NSAttributedStringKey(__ODRolloverTokenAttributeName.rawValue)
>> }
>>
>>
>> Is there no way to import this automatically? Was this functionality removed
>> before release even though it was mentioned in SE-0044?
>>
>> Cheers,
>>
>> Marco
>> _______________________________________________
>> swift-users mailing list
>> swift-users@swift.org
>> https://lists.swift.org/mailman/listinfo/swift-users
>
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