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
<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
