I don’t think we need/want to add `@objcstring` or anything like that, but I do
think we should let String enums be @objc (currently it’s int types only) and
imported as const refs.
// Already works
@objc enum IntEnum: Int {
case foo = 1
case bar = 2
}
// "not an integer type"
// Should be allowed.
@objc enum StrEnum: String {
case foo
case bar = "baz"
}
Becomes
// Current
typedef NS_ENUM(NSInteger, IntEnum) {
IntEnumFoo = 1,
IntEnumBar = 2
};
// Proposed (static or extern, depending on implementation)
NSString *const StrEnumFoo = @“foo";
NSString *const StrEnumBar = @“baz";
In fact, I’d go a step further and say any RawRepresentable enum as a globally
initialized const in objc should be allowed the same treatment. Though the only
other type that comes to mind is float/double.
> On Feb 20, 2017, at 4:07 PM, Derrick Ho via swift-evolution
> <[email protected]> wrote:
>
> Swift should not forsake objective-c. At least not when it comes enum
> strings. Although swift enums are suppose to be swift only, I think we
> should add a new attribute to slightly relax that. I think a good attribute
> would be @objcstring.
>
> By adding @objcstring, an objective-c exclusive class will be generated.
>
> @objcstring
> enum Planet {
> case Jupiter
> }
>
> I have written up a proposal with more details on what it would look for
> objective-c.
>
> https://github.com/wh1pch81n/swift-evolution/blob/swift-enum-objc/proposals/NNNN-Swift-enum-strings-ported-to-Objective-c.md
>
> <https://github.com/wh1pch81n/swift-evolution/blob/swift-enum-objc/proposals/NNNN-Swift-enum-strings-ported-to-Objective-c.md>
>
> If no one objects to this proposal I'll submit it.
>
> **notes: I am reviving this discussion so that I may submit this for Swift 4
> stage 2
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