從 JSON 解碼到 PropertyWrapper

Question

我想將 JSON 字符串解碼為People ，如下所示。 age為數字（ Int ）類型，以下代碼出錯：

"Expected to decode Dictionary<String, Any> but found a number instead."

我認為這意味着@Age被視為Dictionary<String, Any> 。

有什么方法可以將 JSON 值解碼為PropertyWrapper屬性？

let jsonString =
"""
{
"name": "Tim",
"age": 28
}
"""

@propertyWrapper
struct Age: Codable {
    var age: Int = 0
    var wrappedValue: Int {
        get {
            return age
        }

        set {
            age = newValue * 10
        }
    }
}

struct People: Codable {
    var name: String
    @Age var age: Int
}

let jsonData = jsonString.data(using: .utf8)!
let user = try! JSONDecoder().decode(People.self, from: jsonData)
print(user.name)
print(user.age)

Answer 1

感謝評論，添加它使其工作。

extension People {
    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)

        name = try values.decode(String.self, forKey: .name)
        age = try values.decode(Int.self, forKey: .age)
    }
}