Codable [String: Any] 字典

Question

在我的代码中，我有一个 class 和一个类型为 [String: Any] 的属性。在实现 Codable 协议时，编译器显示错误

Protocol type 'Any' cannot conform to 'Decodable' because only concrete types can conform to protocols

open class MMSDKNotification: Codable {

    enum MMSDKNotificationKeys: String, CodingKey { // declaring our keys
        case id = "id"
        case message = "message"
        case isRead = "isRead"
        case creationTime = "creationTime"
    }

    public var id: Int = 0
    public var message: [String: Any]?
    public var isRead: Bool = false
    public var creationTime: Int = 0

    required public init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: MMSDKNotificationKeys.self) // defining our (keyed) container

        self.id = try container.decode(Int.self, forKey: .id)

        // Here is the error:
        // Protocol type 'Any' cannot conform to 'Decodable' because only concrete types can conform to protocols

        self.message = try container.decode(String.self, forKey: .type)

        self.isRead = try container.decode(Bool.self, forKey: .isRead)
        self.creationTime = try container.decode(Int.self, forKey: .creationTime)

    }

    public func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: MMSDKNotificationKeys.self)

        try container.encode(id, forKey: .id)
        try container.encode(isRead, forKey: .isRead)
        try container.encode(creationTime, forKey: .creationTime)
    }
}

是否可以将 Codable 与 [String: Any] 字典一起使用？

Answer 1

Is it possible to use Codable with [String: Any] dictionary?

不，你不能使用 Codable，你必须明确编写应符合 Codable 的类型，否则使用 SwiftyJSON/JSONSerialization

Answer 2

Is it possible to use Codable with [String: Any] dictionary?

不，你不能使用 Codable，但你可以在新模型中制作这本词典。

替换

public var message: [String: Any]?

与

public var message: MessageModel?

struct MessageModel: Codable { }

Codable [String: Any] 字典

Codable [String: Any] dictionary

swift

codable