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giginet/RawRepresentable+Codable.swift

Created February 14, 2018 04:56
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RawRepresentable+Codable.swift
enum Foo: String, Codable {
case a
case b
case c
}
extension RawRepresentable where RawValue == String, Self: Codable {
init(from decoder: Decoder) throws {
var container = try decoder.unkeyedContainer()
let rawValue = try container.decode(String.self)
do {
self.init(rawValue: rawValue)!
}
}
func encode(to encoder: Encoder) throws {
var container = encoder.unkeyedContainer()
try container.encode(rawValue)
}
}
let encoded = try? JSONEncoder().encode(Foo.a)
let decoded = try? JSONDecoder().decode(Foo.self, from: encoded!)
@bannzai
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bannzai commented Feb 14, 2018 •
edited
Loading 

enum Foo: String, Codable {
    case a
    case b
    case c
}

struct Hoge: Codable {
    let foo: Foo?
}

let response = """
{
"foo": "d"
}
"""

let json = response.data(using: .utf8)!
do {
    let decoded = try JSONDecoder().decode(Hoge.self, from: json)
    print("decoded value: \(decoded)")
} catch {
    print("error: \(error.localizedDescription)")
    // error: The data couldn’t be read because it isn’t in the correct format.
}

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