[swift-evolution] Notification.Name

Brent Royal-Gordon brent at architechies.com
Wed Jun 29 21:13:18 CDT 2016

Not 100% sure this belongs here, but I'll bite.

The new `Notification.Name` type is a beautiful application of SE-0033 "Import Objective-C Constants as Swift Types"[1] which removes a lot of boilerplate. However,  I think it puts the resulting constants in the wrong place. They all get piled into `Notification.Name`, resulting in:


I think these would be a lot better off as:


Most of these could probably be inferred by prefix matching, but some, like `TimeZone.systemTimeZoneDidChange` and `FileManager.ubiquityIdentityDidChange`, would probably have to be done manually. There might even be a few which have no natural attachment point, though I can't think of any off the top of my head.

To be clear, I don't think we want this behavior on all `swift_wrapper` types. For instance, the specified behavior is probably appropriate for `HKQuantityTypeIdentifier` and `NSErrorDomain`, the primary examples in SE-0033. But `Notification.Name` is a slightly different use from what we imagined for this feature, and I think it needs a slightly different behavior.

So, what's the best way to pursue fixing this issue?

1. A new proposal, perhaps introducing `swift_wrapper(struct,prefix_matched)`?

2. An amendment to SE-0033?

3. A radar filed with the Foundation team?

4. A blizzard of radars filed with *every* framework team?

5. Deferral to post-Swift 3?

[1] https://github.com/apple/swift-evolution/blob/master/proposals/0033-import-objc-constants.md

Brent Royal-Gordon

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