Encode enum with NSCoding

Question

I am implementing NSCoding in my library, but I need to serialize an enum variable and I can't pass it in for the function that takes AnyObject?. How would this be done in Swift? Here is my enum:

enum ServerType {
  case PC
  case PE
}

Also, toRaw() and fromRaw() do not exist for ServerType. The only property I can access is hashValue, and there are no methods I can access.

Possible duplicate of [How do I encode enum using NSCoder in swift?](http://stackoverflow.com/questions/26326645/how-do-i-encode-enum-using-nscoder-in-swift) — Nero, Dec 24 '16 at 09:26
@Teddy I get the error: "Argument labels '(CUnsignedShort:)' do not match any available overloads" — Bennett, Dec 24 '16 at 09:36

Coder-256 · Accepted Answer · 2018-05-31T22:33:53.913

3

This is similar to @Bennett's answer, but it you can use it with NSNumber as shown:

enum ServerType: UInt {
    case PC
    case PE
}

let someType: ServerType = .PE
NSNumber(value: someType.rawValue) // 1

edited May 31 '18 at 22:33

answered Dec 24 '16 at 17:28

Coder-256

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Would also work, but I just noticed that for my code there is a case where it should be string. – Bennett Dec 24 '16 at 17:29
Yes, but I also included this because it has some advantages. Your solution allows for reordering but not renaming the cases, but mine allows for renaming but not reordering the cases which I think is more useful. You can use either answer, just be sure to mark one of them as correct if it works. – Coder-256 Dec 24 '16 at 17:32
Yeah, but I'm changing a path like `https://example.com/` to `https://example.com/pc` or `https://example.com/pe` depending on the value. If it's a string, I can just say `case PC = "pc"` and `case PE = "pe"` and then use `https://example.com/\(serverValue.rawValue)"`. In an ambiguous case, this would work and have advantages. – Bennett Dec 24 '16 at 17:35
@Bennett You still can. Just do: `"https://example.com/\(someType)"` or, in your case, `"https://example.com/\(serverValue)"` – Coder-256 Dec 24 '16 at 17:37
But then it would be `https://example.com/1` (if `serverValue = .PE`) instead of `https://example.com/pe` – Bennett Dec 24 '16 at 17:40
@Bennett Strange, both of these worked just fine in my testing: `let url = "https://example.com/\(someType)"` or `let url = "https://example.com/\(ServerType.PE)"`. – Coder-256 Dec 24 '16 at 17:42
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/131420/discussion-between-bennett-and-coder256). – Bennett Dec 24 '16 at 17:43

score 0 · Answer 2 · answered Dec 24 '16 at 17:24

0

Change your code to

enum ServerType : String {
  case PC
  case PE
}

and you should be able to use the rawValue parameter.

answered Dec 24 '16 at 17:24

Bennett

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Encode enum with NSCoding

2 Answers2