swift - 为单个属性使用多个 CodingKey

Question

是否可以为单个属性使用多个 CodingKey？

struct Foo: Decodable {

    enum CodingKeys: String, CodingKey {
        case contentIDs = "contentIds" || "Ids" || "IDs" // something like this?
    }

    let contentIDs: [UUID]
}

Answer 1

您可以通过使用多个 CodingKey 枚举和自定义初始化程序来实现。让我举个例子说明一下

enum CodingKeys: String, CodingKey {
    case name = "prettyName"
}

enum AnotherCodingKeys: String, CodingKey {
    case name
}

init(from decoder: Decoder) throws {
    let condition = true // or false
    if condition {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        name = try values.decode(String.self, forKey: .name)
    } else {
        let values = try decoder.container(keyedBy: AnotherCodingKeys.self)
        name = try values.decode(String.self, forKey: .name)
    }
}