您可以使用QuickType解析JSON中的模型数据。

// MARK: - DataModel
struct DataModel: Codable {
    let title: String
    let blanks: [String]
    let value: [Value]
}

enum Value: Codable {
    case integer(Int)
    case string(String)

    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        if let x = try? container.decode(Int.self) {
            self = .integer(x)
            return
        }
        if let x = try? container.decode(String.self) {
            self = .string(x)
            return
        }
        throw DecodingError.typeMismatch(Value.self, DecodingError.Context(codingPath: decoder.codingPath, debugDescription: "Wrong type for Value"))
    }

    func encode(to encoder: Encoder) throws {
        var container = encoder.singleValueContainer()
        switch self {
        case .integer(let x):
            try container.encode(x)
        case .string(let x):
            try container.encode(x)
        }
    }
}

请使用以下代码检查下面Value的值类型。

let jsonData = jsonString.data(using: .utf8)!
let dataModel = try? JSONDecoder().decode(DataModel.self, from: jsonData)
dataModel?.value.forEach { value in
    switch value {
    case .integer(let intValue):
        print(intValue)
    case .string(let stringValue):
        print(stringValue)
    }
}

Decodable需要符合协议的具体类型。不支持Any(Object)。
您可以手动将Value编码为UnkeyedContainer**。结果是strings中的字串数组和integer中的整数值。

struct DataModel: Decodable {
    let title: String
    let blanks: [String]
    let value: Value
}

struct Value: Decodable {
    let strings : [String]
    let integer : Int
    
    init(from decoder: Decoder) throws {
        var container = try decoder.unkeyedContainer()
        var stringData = [String]()
        guard let numberOfItems = container.count else {
            throw DecodingError.dataCorruptedError(in: container,
                                                   debugDescription: "Number of items in the array is unknown")
        }
        while container.currentIndex < numberOfItems - 1 {
            stringData.append(try container.decode(String.self))
        }
        strings = stringData
        integer = try container.decode(Int.self)
    }
}

注：JSON值永远不是对象（引用类型）。